package main
import "fmt"

func main() {
  var n int 
  fmt.Scan(&n)
  a := make([]int,n)
  for i := 0;i < n - 1; i++ {
    fmt.Scan(&a[i])
  }
  sum := 0
  for i := 0;i < n-1; i++ {
    sum += a[i]
  }
  ans := 0
  for i := 0;i <= 100; i++ {
    if (sum+i) % n == 0 {
      ans ++
    }
  }
  
  fmt.Print(ans)
}