def main():
    A, B, C = map(int, input().split())
    N = 0
    number = 0

    result = []

    for N in range(10 ** 5):
        N += 1
        if N * A > B:
            number = N * A - B
        else:
            number = N * A
        if number == C:
            result.append(N)

    if len(result) >= 1:
        for r in result:
            print(r)
    else:
        print(int("-1"))


if __name__ == '__main__':
    main()