#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<n;i++)
typedef pair<int,int>P;

int main(){
  int n;
  cin>>n;
  if(n==1){
    cout<<101<<endl;
    return 0;
  }
  int a[n-1];
  int sum=0;
  rep(i,n-1) {
    cin>>a[i];
    sum+=a[i];
  }
  int start=(n-sum%n)%n;
  //cout<<sum<<endl;
  //cout<<start<<endl;
  int cnt=0;
  while(start<=100){
    start+=n;
    cnt++;
  }
  cout<<cnt<<endl;
  return 0;
}