// No.1406 Test
package main

import (
	"fmt"
	"math"
)

func main() {
	var n int
	fmt.Scan(&n)
	var sum, a = 0, 0
	for i := 0; i < n-1; i++ {
		fmt.Scan(&a)
		sum += a
	}
	ans := 0
	for j := 0; j <= 100; j++ {
		w := (float64(sum) + float64(j)) / float64(n)
		if w == math.Ceil(w) {
			ans++
		}
	}
	fmt.Println(ans)
}