#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <vector>
using namespace std;
typedef pair<int, int> pii;
#define rep(i,x) for(int i=0;i<(int)(x);++i)

int main(){
    int n, sum = 0, ret = 0;
    cin >> n;
    vector<int> c(n);
    rep(i, n) {
        cin >> c[i];
        sum += c[i];
    }
    rep(i, n) if (c[i] * 10 <= sum) ++ret;
    cout << 30 * ret << endl;
    return 0;
}