Have fun with Scanf

scanf-fun.go

package main

import "fmt"

func main() {
        var s []int

        for {
                var n int
                fmt.Println("Please enter the number or zero to exit")
                fmt.Scanf("%d", &n)
                if n == 0 {
                        break
                } else {
                        s = append(s, n)
                }
        }

        var sum int
        for _, v := range s {
                sum += v
        }
        fmt.Println(sum)
}

The above code has an issue with reading from the command line, can you guess the issue?