> #include <iostream>
> #define MAX 7500
> #define For(i,a,b) for(int i = a;i <= b;i++)
> using namespace std;
> 
> int dp[22][15002];
> int cc[22];
> int cg[22];
> 
> int main()
> {
>     int c,g;
>     while(scanf("%d%d",&c,&g) != EOF)
>     {
>         memset(dp,0,sizeof(dp));
>         dp[0][7500] = 1;
>         For(i,1,c)  scanf("%d",&cc[i]);
>         For(i,1,g)  scanf("%d",&cg[i]);
>         For(i,1,g)
>             For(j,1,15000)
>                 if(dp[i-1][j])
>                     For(k,1,c)
>                         dp[i][j + cg[i] * cc[k]] += dp[i - 1][j];
>         cout << dp[g][7500] << endl;
>     }
>     return 0;
> }