gcd.py


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#!/usr/bin/env python3

import sys
import functools


def gcd2(a, b):
    if b == 0:
        return a
    else:
        return gcd2(b, a % b)


def gcdn(ns):
    return functools.reduce(gcd2, ns)


ints = map(int, sys.argv[1:])
gcd = gcdn(ints)
print(gcd)