CF1136A.Nastya Is Reading a Book

After lessons Nastya decided to read a book. The book contains $n$ chapters, going one after another, so that one page of the book belongs to exactly one chapter and each chapter contains at least one page.

Yesterday evening Nastya did not manage to finish reading the book, so she marked the page with number $k$ as the first page which was not read (i.e. she read all pages from the $1$-st to the $(k-1)$-th).

The next day Nastya's friend Igor came and asked her, how many chapters remain to be read by Nastya? Nastya is too busy now, so she asks you to compute the number of chapters she has not completely read yet (i.e. the number of chapters she has not started to read or has finished reading somewhere in the middle).

课后，娜斯佳决定读一本书。这本书包含 $n$ 章，按顺序连续排列，使得书中的每一页恰好属于其中一章，且每一章至少包含一页。

昨天晚上，娜斯佳未能读完这本书，因此她将页码为 $k$ 的那一页标记为尚未阅读的第一页（即她已读完了从第 $1$ 页到第 $(k-1)$ 页的所有页面）。

第二天，娜斯佳的朋友伊戈尔来问她：娜斯佳还有多少章尚未读完？娜斯佳现在太忙了，因此请你帮她计算她尚未完整读完的章节数量（即：她尚未开始阅读，或仅读到某一章中间就停止了的章节数量）。

The first line contains a single integer $n$ ($1 \leq n \leq 100$) — the number of chapters in the book.

There are $n$ lines then. The $i$-th of these lines contains two integers $l_i$, $r_i$ separated by space ($l_1 = 1$, $l_i \leq r_i$) — numbers of the first and the last pages of the $i$-th chapter. It's guaranteed that $l_{i+1} = r_i + 1$ for all $1 \leq i \leq n-1$, and also that every chapter contains at most $100$ pages.

The $(n+2)$-th line contains a single integer $k$ ($1 \leq k \leq r_n$) — the index of the marked page.

第一行包含一个整数 $n$（$1 \leq n \leq 100$）—— 表示书中章节数。

接下来有 $n$ 行。其中第 $i$ 行包含两个由空格分隔的整数 $l_i$ 和 $r_i$（$l_1 = 1$，$l_i \leq r_i$）—— 分别表示第 $i$ 章的起始页码和结束页码。题目保证对所有 $1 \leq i \leq n-1$ 均有 $l_{i+1} = r_i + 1$，且每章至多包含 $100$ 页。

第 $(n+2)$ 行包含一个整数 $k$（$1 \leq k \leq r_n$）—— 表示被标记页码的编号。

Print a single integer — the number of chapters which has not been completely read so far.

输出一个整数——截至目前尚未完全阅读的章节数。

In the first example the book contains $11$ pages and $3$ chapters — $[1;3]$, $[4;7]$ and $[8;11]$. Nastya marked the $2$-nd page, so she finished in the middle of the $1$-st chapter. So, all chapters has not been read so far, so the answer is $3$.

The book in the second example contains $12$ pages and $3$ chapters too, but Nastya finished reading in the middle of the $2$-nd chapter, so that the answer is $2$.

在第一个例子中，这本书共有 $11$ 页和 $3$ 章——分别为 $[1;3]$、$[4;7]$ 和 $[8;11]$。娜斯佳标记了第 $2$ 页，因此她停在了第 $1$ 章的中间。所以，截至目前所有章节都尚未读完，答案为 $3$。

第二个例子中的书也包含 $12$ 页和 $3$ 章，但娜斯佳停在了第 $2$ 章的中间，因此答案为 $2$。