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()