def main():
    a, b, c = map(int, input().split())
    left, right = 0, c

    def isok(y):
        tot = (y - y // a) + b * (y // a)
        return tot >= c

    while right - left > 1:
        mid = left + (right - left) // 2
        if isok(mid):
            right = mid
        else:
            left = mid
    print(right)


if __name__ == "__main__":
    main()