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;
}