required_inputs = int(input("For how many numbers would you like to find their GCD?: "))
received_inputs = []

for num in range(0, required_inputs):
    values = int(input())
    received_inputs.append(values)
if len(received_inputs) == 0:
    values = int(input())
    received_inputs.append(values)

def GCD(a, b):
    if b == 0:
    return a
else:
    return GCD(b, a % b)

print(GCD(received_inputs[0], received_inputs[1]))