［AtCoder］ABC-163｜B - Homework

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• 🔗ABC-163 B - Homework

提出結果

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


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


def main():
    n, m = getIntMap()
    a = getIntList()

    b = n - sum(a)

    print(b if b >= 0 else -1)


if __name__ == "__main__":
    main()