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#include <bits/stdc++.h>
using namespace std;
const int N = 1010;
int m, n;
int f[N];
// 经典01背包
// 采药总时间相当于背包容量，每一株药相当于一件物品，采药时间相当于该物品的体积，草药的价值相当于物品价值。
int main() {
cin >> m >> n;
for (int i = 0; i < n; i++) {
int v, w; // v体积，w价值
cin >> v >> w;
for (int j = m; j >= v; j--)
f[j] = max(f[j], f[j - v] + w);
}
cout << f[m] << endl;
return 0;
