#include <bits/stdc++.h>
typedef long long LL;
#define SZ(X) ((int)(X).size())
#define ALL(X) (X).begin(), (X).end()
#define RALL(X) (X).rbegin(), (X).rend()
#define REP(I, N) for (int I = 0; I < (N); ++I)
#define REPP(I, A, B) for (int I = (A); I < (B); ++I)
#define RI(X) scanf("%d", &(X))
#define RII(X, Y) scanf("%d%d", &(X), &(Y))
#define RIII(X, Y, Z) scanf("%d%d%d", &(X), &(Y), &(Z))
#define DRI(X) int (X); scanf("%d", &X)
#define DRII(X, Y) int X, Y; scanf("%d%d", &X, &Y)
#define DRIII(X, Y, Z) int X, Y, Z; scanf("%d%d%d", &X, &Y, &Z)
#define DRVI(N, X) VI X(N); for (int ___I=0; ___I<n; ___I++) scanf("%d", &(X[___I]))  
#define RS(X) scanf("%s", (X))
#define CASET int ___T, case_n = 1; scanf("%d ", &___T); while (___T-- > 0)
#define MP make_pair
#define PB push_back
#define MS0(X) memset((X), 0, sizeof((X)))
#define MS1(X) memset((X), -1, sizeof((X)))
#define LEN(X) strlen(X)
#define PII pair<int,int>
#define VI vector<int>
#define VL vector<long long>
#define VPII vector<pair<int,int> >
#define PLL pair<long long,long long>
#define VPLL vector<pair<long long,long long> >
#define F first
#define S second

using namespace std;

int main(){
    DRI(n);
    DRI(g);
    REP(i,n-1){
        DRI(x);
        g=__gcd(x,g);
    }
    printf("%d\n",g);
}

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

ll gcd(ll x, ll y){
	if(x%y == 0){
		return y;
	}else{
		return gcd(y, x%y);
	}
}

int main(){
	int N; cin >> N;
	int ans;
	for(int i=0; i<N; i++){
		int a; cin >> a;
		if(i==0){
			ans = a;
		}else{
			ans = gcd(ans, a);
		}
	}
	cout << ans << endl;
	return 0;
}