问题 1083 --So Easy!

1083: So Easy!

时间限制: 1 Sec  内存限制: 32 MB
提交: 11  解决: 2
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题目描述

  A sequence Sn is defined as:

Where a, b, n, m are positive integers.┌x┐is the ceil of x. For example, ┌3.14┐=4. You are to calculate Sn.
  You, a top coder, say: So easy!

输入

  There are several test cases, each test case in one line contains four positive integers: a, b, n, m. Where 0< a, m < 215, (a-1)2< b < a2, 0 < b, n < 231.The input will finish with the end of file.

输出

  For each the case, output an integer Sn.

样例输入

2 3 1 2013
2 3 2 2013
2 2 1 2013

样例输出

4
14
4

提示

来源

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