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   | #include <iostream> #include <cstring> #include <algorithm>
  using namespace std;
  const int N = 30, M = 30010;
  int n, m; int f[M];
  int main() {     cin >> m >> n;     for (int i = 1; i <= n; i ++ )     {         int v, w;         cin >> v >> w;         w = v * w;         for (int j = m; j >= v; j -- )             f[j] = max(f[j], f[j - v] + w);     }     cout << f[m] << endl;     return 0; }
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