func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, x, y;     int a[1005], b[1005], c[1005], d[1005];     cin >> n >> m >> x >> y;     for (int i = 1; i <= m; i++) {       cin >> a[i] >> b[i] >> c[i] >> d[i];     }     int dp[1005][11];     int temp, i, j, k, t;     for (int i = 0; i <= n; i++) {       dp[i][0] = 0;     }     for (i = 1; i <= n; i++) {       for (j = 1; j <= m; j++) {         temp = -1;         t = a[j] / b[j];         for (k = 0; k <= t; k++)           if (k * c[j] <= i) {             temp = max(temp, dp[i - k * c[j]][j - 1] + k * d[j]);           }         dp[i][j] = temp;       }     }     int Max = -1;     for (int l = 0; l <= n; l++) {       Max = max(Max, dp[l][m] + ((n - l) / x) * y);     }     cout << Max << endl;     return 0;   }   