def main():
    a, b, c = map(int, input().split())
    cycle_ = c // (a - 1 + b)
    rest = c - cycle_ * (a - 1 + b)
    if rest <= (a - 1):
        print(cycle_ * a + rest)
    else:
        print((cycle_ + 1) * a)


if __name__ == "__main__":
    main()