#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> c(n);
    int border = 0;
    for(int i = 0;i < n;i++){
        cin >> c[i];
        border += c[i];
    }
    border /= 10;
    int ans = 0;
    for(int i = 0;i < n;i++){
        if(border >= c[i])ans += 30;
    }
    cout << ans << endl;
    return 0;
}