#include <iostream>
using namespace std;
int main(){
	int n,sum=0,money=0;
	cin >> n;
	int c[n];
	for(int i=0;i<n;i++){
		cin >> c[i];
		sum+=c[i];
	}
	sum/=10;
	for(int i=0;i<n;i++)if(sum>=c[i])money++;
	cout << money*30 << endl;
}