# 求最大公因數

def gcd(a, b):

    if a % b == 0:

        return b

    else:

        return gcd(b, a % b)

# 使用迴圈讀入多組資料

while True:

    try:

        n = int(input())

        g = int(input())

        for i in range(1, n):

            a = int(input())

            # 求最大公因數

            g = gcd(g, a)

        print(g)

    except EOFError:

        break