diff --git a/AVL.java b/AVL.java
index 7f0fbeb..3a4fa1d 100644
--- a/AVL.java
+++ b/AVL.java
@@ -220,5 +220,5 @@ public static void main (String[] args) throws java.lang.Exception{
 		tree.print(1);
 		tree.print(2);
 		tree.print(3);
-	}
+	}//hello frnd
 }
diff --git a/Binary Index Tree.java b/Binary Index Tree.java
index 29b82c3..9dbb302 100644
--- a/Binary Index Tree.java	
+++ b/Binary Index Tree.java	
@@ -24,7 +24,7 @@ public BinaryIndexedTree(int[] arr){
 
 			int sum = 0;
 			for(int i = 1; i < this.size; i++){
-				sum += arr[i];
+				sum = sum + arr[i];
 				prefix[i] = sum;
 			}
 
@@ -85,4 +85,4 @@ public static void main (String[] args) throws java.lang.Exception{
 		System.out.println("" + BT.rangeSum(1,5));	
 
 	}
-}
\ No newline at end of file
+}