import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

from fractions import gcd

#処理内容
def main():
	N = int(input())
	A = int(input())
	val = A
	for i in range(N - 1):
		a = int(input())
		val = gcd(val, a)

	print(val)

if __name__ == '__main__':
	main()