#include <iostream>
using namespace std;
int main(){
	int n,a[10]={0},c=0,b=0;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
		if(a[i]==10)c++;
		else b++;
	} 
	if(c>b) cout<<"10";
	else cout<<"20";
}
/**************************************************************
	Problem: 1808
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/