#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define fi first
#define se second
#define endl '\n'
#define MAX INT_MAX
#define MIN INT_MIN
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define mod 1000000007
#define pb push_back
#define sz(a) (int)((a).size())
#define all(a) a.begin(),a.end()
#define FOR(i, a, b) for (int i = a; i <= b; i++)
#define forn(i, n) for (int i = 0; i < n; i++)
typedef vector<int> vi;
typedef vector< vi > vvi;
typedef pair< int,int > pii;
 
 
 
int32_t main()
{
    fast

   int test=1;
   //cin>>test;
  while(test--)
  {

    int n;
    cin>>n;
    set<int> s;
    int x;
    forn(i,n)
    {
        cin>>x;
        s.insert(x);
    }

    while(s.size()>1)
    {
        int mn=*s.begin();
        int mx=*s.rbegin();
        s.erase(mx);
        s.insert(mx-mn);
    }

    cout<<*s.begin();


  //while loop ending   
  }


  return 0;
  }
#include <iostream>
#include <vector>
#include <deque>
#include <algorithm>
#include <numeric>
#include <string>
#include <cstring>
#include <list>
#include <unordered_set>
#include <tuple>
#include <cmath>
#include <limits>
#include <type_traits>
#include <iomanip>
#include <map>
#include <unordered_map>
#include <queue>
#include <stack>
#include <set>
#include <bitset>
#include <regex>
#include <random>
#include<bits/stdc++.h>
//#include<atcoder/all>


using namespace std;
//using namespace atcoder;

typedef long long ll;
#define rep(i,n)for(ll i=0;i<n;++i)
#define exout(x) printf("%.12f\n", x)
const double pi = acos(-1.0);
const ll MOD = 1000000007;
const ll INF = 1e18;
const ll MAX_N = 1010101;

//組み合わせの余りを求める
ll fac[MAX_N], finv[MAX_N], inv[MAX_N];
void COMinit() {
	fac[0] = fac[1] = 1;
	finv[0] = finv[1] = 1;
	inv[1] = 1;
	for (int i = 2; i < MAX_N; i++) {
		fac[i] = fac[i - 1] * i % MOD;
		inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
		finv[i] = finv[i - 1] * inv[i] % MOD;
	}
}

// 二項係数計算
long long COM(ll n, ll k) {
	if (n < k) return 0;
	if (n < 0 || k < 0) return 0;
	return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

// mod.m での a の逆元 a^ { -1 } を計算する
long long modinv(long long a, long long m) {
	long long b = m, u = 1, v = 0;
	while (b) {
		long long t = a / b;
		a -= t * b; swap(a, b);
		u -= t * v; swap(u, v);
	}
	u %= m;
	if (u < 0) u += m;
	return u;
}

//最大公約数
ll gcd(ll x, ll y) {
	return y ? gcd(y, x % y) : x;
}

ll lcm(ll x, ll y) {
	if (x == 0 || y == 0)return 0;
	return (x /gcd(x, y) * y );
}

//union-find木について
ll par[101010];
ll rank2[101010];

void init(ll n) {
	rep(i, n) {
		par[i] = i;
		rank2[i] = 0;
	}
}

ll find(ll x) {
	if (par[x] == x) {
		return x;
	}
	else {
		return par[x] = find(par[x]);
	}
}

void unite(ll x, ll y) {
	x = find(x);
	y = find(y);
	if (x == y)return;
	if (rank2[x] < rank2[y]) {
		par[x] = y;
	}
	else {
		par[y] = x;
		if (rank2[x] == rank2[y]) {
			rank2[x]++;
		}
	}
}


ll dx[8] = { 1,-1,0,0,1,1,-1,-1 };
ll dy[8] = { 0,0,1,-1,1,-1,1,-1 };

//long longしか使わない
//素数は1より大きい
//lower_boundは指定したkey以上の要素の一番左のイテレータをかえす
//upper_boundは指定したkeyより大きい要素の一番左のイテレータをかえす
int main() {
	ll n;
	cin >> n;
	vector<ll>a(n);
	priority_queue<ll>q1;
	rep(i, n) {
		cin >> a[i];
	}
	ll ans = a[0];
	rep(i, n) {
		ans = gcd(ans, a[i]);
	}
	cout << ans << endl;
	return 0;
}
