#include <stdio.h>
void main(void){
    int n = 0 ;
    scanf("%d",&n);
    int numList[n-1] = {};
    int ave = 0;
    for(int i = 0 ; i < n-1 ; i++ ){
        scanf("%d",&numList[i]);
        ave += numList[i];
    }
    int count = 0 ;
    for(int i = 1 ; i <= 100 ; i++){
        if((ave+i)%n == 0){
            count++;
        }
    }

    
    printf("%d",count);
}