#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: yangjunwen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/