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#include<bits/stdc++.h>
using namespace std;

int n;
int emp;
priority_queue<int,vector<int>,greater<int> > pq;

int main(){

    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>emp;
        pq.push(emp);
    }
    while(pq.size()>1){
        int a=pq.top();pq.pop();
        int b=pq.top();pq.pop();
        if(b%a){
            pq.push(b%a);
        }
        pq.push(a);
    }
    cout<<pq.top()<<endl;

    return 0;
}

Measured memory_bytes: 892