#include <cstdio>
#include <vector>
using namespace std;
int main(){
	int n, v, vote = 0, cnt = 0;
	vector<int> c;
	scanf("%d", &n);
	for(int i=0; i<n; i++){
		scanf("%d", &v);
		c.push_back(v);
		vote += v;
	}
	vote /= 10;
	while(n--)	if(c[n] <= vote)	cnt++;
	printf("%d\n", cnt*30);
}