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