func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, k, f[101][50001], a[101], b[101];   int main() {     scanf( %d%d , &n, &k);     for (int i = 1; i <= n; i++) scanf( %d , &a[i]);     for (int i = 1; i <= n; i++) scanf( %d , &b[i]);     for (int i = 0; i <= 100; i++)       for (int j = 0; j <= 50000; j++) f[i][j] = -99999999;     f[0][20000] = 0;     for (int i = 1; i <= n; i++)       for (int j = -10000; j <= 10000; j++)         f[i][j + 20000] = max(f[i][j + 20000],                               max(f[i - 1][j + 20000],                                   f[i - 1][j - a[i] + k * b[i] + 20000] + a[i]));     int ans = -1;     if (f[n][20000]) ans = f[n][20000];     printf( %d , ans);   }   