#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
#include<valarray>
//#include<bits/stdc++.h>
//using namespace std;
using namespace std;

int main(){
	int n;
	scanf("%d", &n);
	vector<long long int> v;
	long long int sum = 0;
	for (int i = 0; i < n; i++){
		long long int a;
		scanf("%lld", &a);
		v.push_back(a);
		sum += a;
	}
	sum /= 10LL;
	sum++;
	long long int ans = 0;
	for (int i = 0; i < n; i++){
		if (v[i] < sum){
			ans += 30LL;
		}
	}
	printf("%lld\n", ans);
	return 0;
}