func_code_string: #include <bits/stdc++.h>   inline int getx() {     char c;     int x;     for (c = getchar(); c <  0  || c >  9 ; c = getchar())       ;     for (x = 0; c >=  0  && c <=  9 ; c = getchar())       x = (x << 3) + (x << 1) + c -  0 ;     return x;   }   bool upmax(int &a, const int &b) { return a < b ? a = b, 1 : 0; }   const int MAX_N = 10050;   int n, m;   int v[MAX_N], c[MAX_N];   int f[MAX_N];   int main() {     n = getx(), m = getx();     int c0 = getx(), d0 = getx();     for (int i = c0; i <= n; ++i) upmax(f[i], f[i - c0] + d0);     for (int i = 1; i <= m; ++i) {       int a = getx(), b = getx(), c = getx(), d = getx();       for (int p = b; p <= a; p += b) {         for (int j = n; j >= c; --j) upmax(f[j], f[j - c] + d);       }     }     printf( %d n , f[n]);   }   