diff --git a/gen/org/solovyev/android/calculator/R.java b/gen/org/solovyev/android/calculator/R.java
index 37993712..b7275ca9 100644
--- a/gen/org/solovyev/android/calculator/R.java
+++ b/gen/org/solovyev/android/calculator/R.java
@@ -49,25 +49,23 @@ containing a value of this type.
         public static final int divisionButton=0x7f090011;
         public static final int editText=0x7f090006;
         public static final int eigthDigitButton=0x7f090014;
-        public static final int equalsButton=0x7f090016;
+        public static final int equalsButton=0x7f09001d;
         public static final int fiveDigitButton=0x7f09000f;
         public static final int fourDigitButton=0x7f09000e;
-        public static final int historyButton=0x7f090020;
-        public static final int menu_item_help=0x7f090022;
-        public static final int menu_item_settings=0x7f090021;
+        public static final int historyButton=0x7f09001e;
+        public static final int menu_item_help=0x7f090020;
+        public static final int menu_item_settings=0x7f09001f;
         public static final int muliplicationButton=0x7f09000c;
         public static final int nineDigitButton=0x7f090015;
-        public static final int numericButton=0x7f09001e;
         public static final int oneDigitButton=0x7f090009;
         public static final int panelswitch=0x7f090008;
         public static final int piButton=0x7f09001c;
         public static final int plusButton=0x7f09000d;
-        public static final int pointDigitButton=0x7f09001d;
+        public static final int pointDigitButton=0x7f090016;
         public static final int resultEditText=0x7f090007;
         public static final int roundBracketsButton=0x7f090019;
         public static final int sevenDigitButton=0x7f090013;
         public static final int simplePad=0x7f090000;
-        public static final int simplifyButton=0x7f09001f;
         public static final int sixDigitButton=0x7f090010;
         public static final int sqrtButton=0x7f090017;
         public static final int squareBracketsButton=0x7f09001a;
diff --git a/res/layout/main.xml b/res/layout/main.xml
index dd3a7bd7..3a3be71d 100644
--- a/res/layout/main.xml
+++ b/res/layout/main.xml
@@ -101,22 +101,26 @@
 				<org.solovyev.android.view.DirectionDragButton a:id="@+id/sevenDigitButton" a:text="7" calc:textUp=""
 															   calc:textDown="" style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
+
 				<org.solovyev.android.view.DirectionDragButton a:id="@+id/eigthDigitButton" a:text="8" calc:textUp=""
 															   calc:textDown="" style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
+
 				<org.solovyev.android.view.DirectionDragButton a:id="@+id/nineDigitButton" a:text="9" calc:textUp=""
 															   calc:textDown="" style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
-				<org.solovyev.android.view.DirectionDragButton a:id="@+id/equalsButton" a:text="="
+				<org.solovyev.android.view.DirectionDragButton a:id="@+id/pointDigitButton" a:text="." calc:textDown=","
 															   style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
-				<org.solovyev.android.view.DirectionDragButton a:id="@+id/sqrtButton" a:text="sqrt"
+
+				<org.solovyev.android.view.DirectionDragButton a:id="@+id/sqrtButton" a:text="√"
 															   style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
 
 			</LinearLayout>
 
 			<LinearLayout a:layout_weight="1" a:layout_width="match_parent" a:layout_height="0dp">
+
 				<org.solovyev.android.view.DirectionDragButton a:id="@+id/zeroDigitButton" a:text="0"
 															   style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
@@ -136,7 +140,7 @@
 															   calc:textDown="}" style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
 
-				<org.solovyev.android.view.DirectionDragButton a:id="@+id/piButton" a:text="pi" calc:textUp="e"
+				<org.solovyev.android.view.DirectionDragButton a:id="@+id/piButton" a:text="π" calc:textUp="e"
 															   style="@style/digitButtonStyle"
 															   a:onClick="digitButtonClickHandler"/>
 
@@ -145,17 +149,19 @@
 
 			<LinearLayout a:layout_weight="1" a:layout_width="match_parent" a:layout_height="0dp">
 
-				<org.solovyev.android.view.DirectionDragButton a:id="@+id/pointDigitButton" a:text="." calc:textDown=","
-															   style="@style/digitButtonStyle"
-															   a:onClick="digitButtonClickHandler"/>
-
-				<org.solovyev.android.view.DirectionDragButton a:id="@+id/numericButton" a:text="numeric"
+				<org.solovyev.android.view.DirectionDragButton a:id="@+id/equalsButton"
+															   a:text="="
+															   a:layout_width="fill_parent"
 															   style="@style/digitButtonStyle"
 															   a:onClick="numericButtonClickHandler"/>
 
-				<org.solovyev.android.view.DirectionDragButton a:id="@+id/simplifyButton" a:text="simplify"
-															   style="@style/digitButtonStyle"
-															   a:onClick="simplifyButtonClickHandler"/>
+				<!--				<org.solovyev.android.view.DirectionDragButton a:id="@+id/numericButton" a:text="numeric"
+																			   style="@style/digitButtonStyle"
+																			   a:onClick="numericButtonClickHandler"/>
+
+								<org.solovyev.android.view.DirectionDragButton a:id="@+id/simplifyButton" a:text="simplify"
+																			   style="@style/digitButtonStyle"
+																			   a:onClick="simplifyButtonClickHandler"/>-->
 
 				<org.solovyev.android.view.DirectionDragButton a:id="@+id/historyButton" calc:textUp="undo"
 															   calc:textDown="redo" style="@style/digitButtonStyle"/>
diff --git a/src/org/solovyev/android/calculator/Preprocessor.java b/src/org/solovyev/android/calculator/Preprocessor.java
index f315b327..60e54bc4 100644
--- a/src/org/solovyev/android/calculator/Preprocessor.java
+++ b/src/org/solovyev/android/calculator/Preprocessor.java
@@ -15,8 +15,12 @@ public class Preprocessor {
 				sb.append('(');
 			} else if (ch == ']' || ch == '}') {
 				sb.append(')');
-			} else if ( ch == ',' ) {
+			} else if (ch == ',') {
 				sb.append('.');
+			} else if (ch == 'π') {
+				sb.append("pi");
+			} else if (ch == '√') {
+				sb.append("sqrt");
 			} else {
 				sb.append(ch);
 			}
@@ -24,8 +28,8 @@ public class Preprocessor {
 
 		return sb.toString();
 	}
-	
-	public static String wrap (@NotNull JsclOperation operation, @NotNull String s) {
-		return operation.name() + "(\"" + s + "\");"; 
+
+	public static String wrap(@NotNull JsclOperation operation, @NotNull String s) {
+		return operation.name() + "(\"" + s + "\");";
 	}
 }
diff --git a/src/org/solovyev/util/math/MathEntityType.java b/src/org/solovyev/util/math/MathEntityType.java
index 248c0b63..db4e5ccb 100644
--- a/src/org/solovyev/util/math/MathEntityType.java
+++ b/src/org/solovyev/util/math/MathEntityType.java
@@ -19,7 +19,7 @@ public enum MathEntityType {
 	
 	private static final List<Character> binaryOperations = Arrays.asList('-', '+', '*', '/', '^' );
 
-	private static final List<String> functions = Arrays.asList("sin", "asin", "cos", "acos", "tg", "atg", "exp", "log", "ln", "mod", "sqrt");
+	private static final List<String> functions = Arrays.asList("sin", "asin", "cos", "acos", "tg", "atg", "exp", "log", "ln", "mod", "√");
 	
 	private static final List<String> groupSymbols = Arrays.asList("[]", "()", "{}");