HDU2566 统计硬币

#include<cmath>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
int main(void)
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int cnt = 0 ;
        int n,m;
        scanf("%d%d",&n,&m);
        for(int i = 0; i <= n; i++)
            for(int j = 0; j <= n; j++)
                for(int k = 0; k <= n; k++)
                    if(i+2*j+5*k==m&&i+j+k==n)
                        cnt++;           
        printf("%d\n",cnt);
    }
    return 0; 
}