diff --git a/hello/main.go b/hello/main.go
index 8ab932f..a8d6e4d 100644
--- a/hello/main.go
+++ b/hello/main.go
@@ -2,8 +2,22 @@ package main
 
 import (
 	"fmt"
+	"math"
 )
 
 func main() {
-	fmt.Println("Hello from Go!")
+	i1, i2, i3 := 12, 22, 45
+	intSum := i1 + i2 + i3
+	fmt.Println("The integer Sum :", intSum)
+
+	f1, f2, f3 := 12.2, 22.4, 45.5
+	floatSum := f1 + f2 + f3
+	fmt.Println("The integer Sum :", floatSum)
+
+	floatSum = math.Round(floatSum*100) / 100
+	fmt.Println("The new integer Sum :", floatSum)
+
+	circleRadius := 15.5
+	circumference := circleRadius * 2 * math.Pi
+	fmt.Printf("circumference : %.2f\n", circumference) // print f change  the output format
 }