标程

#include<bits/stdc++.h>
using namespace std;
#define M 105
#define T 1005
int dp[T];
int t[M], v[M];
int main()
{
    int ta, m;
    cin >> ta >> m;
    for(int i = 1; i <= m; ++i)
        cin >> t[i] >> v[i];
    for(int i = 1; i <= m; ++i)
        for(int j = ta; j >= t[i]; --j)
            dp[j] = max(dp[j], dp[j-t[i]]+v[i]);
    cout << dp[ta];
    return 0;
}