diff --git a/69. Sqrt(x)/main.go b/69. Sqrt(x)/main.go
index 2a9b38e..060aa4f 100644
--- a/69. Sqrt(x)/main.go	
+++ b/69. Sqrt(x)/main.go	
@@ -1,22 +1,4 @@
-package main
-
-import "fmt"
-
-func mySqrt2(x int) int {
-	x0 := 1
-	var tem int
-	for {
-		tem = x0
-		x0 = (x0 + x/x0) / 2
-		fmt.Println(x0)
-		if tem <= x0 {
-			break
-		}
-
-	}
-	return x0
-
-}
+package problem64
 
 func mySqrt(x int) int {
 	if x == 0 {
@@ -28,15 +10,9 @@ func mySqrt(x int) int {
 		mid = (left + right) / 2
 		if mid*mid > x {
 			right = mid
-			fmt.Println("right:", right)
 		} else {
 			left = mid
-			fmt.Println("left:", left)
 		}
 	}
 	return left
 }
-
-func main() {
-	fmt.Println(mySqrt(4))
-}