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#include <bits/stdc++.h>
using namespace std;
const int N = 1010;
int n, m;
int v[N], w[N];
int f[N];
int main() {
cin >> m >> n;
for (int i = 1; i <= n; i++) cin >> v[i] >> w[i];
// 01背包模板
for (int i = 1; i <= n; i++)
for (int j = m; j >= v[i]; j--)
f[j] = max(f[j], f[j - v[i]] + w[i]);
printf("%d\n", f[m]);
return 0;
}