#include <iostream>
#include <cstdlib>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    int N, C; cin >> N;
    int sum = 0;
    int ans = N * 30;
    vector<int> v;
    for(int i = 0; i < N; i++){
        cin >> C;
        v.push_back(C);
        sum += C;
    }
    int ave = sum / N;
    for(int i = 0; i < N; i++){
        if(v[i] <= ave) ans -= 30;
    }
    cout << ans << endl;
    return 0;
}