#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
priority_queue<LL,vector<LL>,greater<LL> > q;
int main(){
    ios::sync_with_stdio(0);
    LL n;
    cin>>n;
    for(LL i=1;i<=n;i++){
        LL x;
        cin>>x;
        q.push(x);
    }
    while(q.size()>1){
        LL x=q.top();q.pop();
        LL y=q.top();q.pop();
        if(x!=y)    q.push(y);
        else    q.push(x+y);
    }
    cout<<q.top();
    return 0;
}