题目比较简单，看答案就能看懂什么意思

#include<stdio.h>
int main()
{
	int count = 0;
	int n;
	scanf("%d", &n);
	for (int i = 0; i <= n; i++)
	{
		for (int k = 0; k <=n/2; k++)
		{
			for (int j = 0; j <= n/5 ; j++)
			{
				if (i + 2 * k + 5 * j == n)
				{
					count++;
				}
			}
		}
	}
	printf("%d\n", count);
	return 0;
}