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#include<bits/stdc++.h>
using namespace std;
/*
知识点内容：动态规则0-1背包问题
文档内容参考：
https://www.cnblogs.com/aiguona/p/7274222.html
*/
int w[105], val[105];
int dp[105][1005];
int main() {
int t, m;
cin >> t >> m;
for (int i = 1; i <= m; i++)
cin >> w[i] >> val[i];
for (int i = 1; i <= m; i++) //物品
for (int j = t; j >= 0; j--) //容量
{
if (j >= w[i])
dp[i][j] = max(dp[i - 1][j - w[i]] + val[i], dp[i - 1][j]);
else
dp[i][j] = dp[i - 1][j];
}
cout << dp[m][t] << endl;
return 0;
