描述http://noi.openjudge.cn/english/23/
How many positive integers are there which is less than N and is a multiple of 3 or a multiple of 5.
输入
One positive integer N (N <= 100000).
输出
One integer.
描述:
有多少个小于3 or 5的正整数
输入：
一个正整数N(小于等于100000)
输出：
一个整数
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