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