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OI-codes/Luogu/P1060/P1060.cpp

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#include <bits/stdc++.h>
using namespace std;
int n, m, v[30005], w[30005], f[30][30005];
int main() {
cin >> n >> m;
for (int i = 1; i <= m; i++) {
cin >> v[i] >> w[i];
w[i] *= v[i];
}
for (int i = 1; i <= m; i++) {
for (int j = 0; j <= n; j++) {
if (j >= v[i]) {
f[i][j] = max(f[i - 1][j], f[i - 1][j - v[i]] + w[i]);
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} else {
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f[i][j] = f[i - 1][j];
}
}
}
cout << f[m][n] << endl;
return 0;
}