#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,a[110],i;
    cin>>n;
    for(i = 1;i <= n;i++){
    	cin>>a[i];
	}
	
	int c1 = 0;
	int c2 = 0;
	
	for(i = 1;i < n;i++){
		if(a[i] == 10) c1++;
		else c2++;
	}
	
	if(c1 > c2){
		cout<<10;
	}else{
		cout<<20;
	}
    return 0;
}
/**************************************************************
	Problem: 1808
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/