［AtCoder］ABC-135｜A - Harmony

設問ページ

• 🔗ABC-135 A - Harmony

提出結果

def getIntMap():
    return map(int, input().split())


def main():
    a, b = getIntMap()

    print((a + b) // 2 if (a + b) % 2 == 0 else 'IMPOSSIBLE')


if __name__ == "__main__":
    main()