Go for statement Sum Natural Numbers

package main/*from   w ww.j ava2  s  . co  m*/

import "fmt"

func main(){
    var n,sum int    
    fmt.Print("Enter a positive integer : ")
    fmt.Scan(&n)
    for i:=1; i<=n; i++ { // assigning 1 to i
        sum += i // sum = sum + i
    }
    fmt.Print("Sum : ",sum)
}