def main():
    a, b, c = map(int, input().split())
    z = [b+c]
    if c <= b:
        z.append(c)
    z = [i//a for i in z if i % a == 0]
    if not z:
        z = [-1]
    for i in z:
        print(i)


if __name__ == '__main__':
    main()