#include<bits/stdc++.h>
using namespace std;
int n,sum,res;
char c[1001000];
int main(){
	cin >> n;
	for(int i = 1;i <= n;i ++){
		cin >> c[i];
	}
	for(int i = 1;i <= n;i ++){
		if(c[i] == '0'){
			res += 10;
            sum += res;
		}else if(c[i] == '1'){
			res = max(res - 5,0);
            sum += res;
		}else if(c[i] == '2'){
		    sum += max(res - 10,0);
		}
		
		//cout << res << " ";
	}
	cout << sum;
	return 0;
}