#include <iostream>
using namespace std;
const int N = 1010;
int v[N], w[N], f[N];
int main() {
int n, m;
cin >> n >> m;
for (int i = 1; i <= n; i ++) cin >> v[i] >> w[i];
for (int i = 1; i <= n; i ++) {
for (int j = v[i]; j <= m; j ++) {
f[j] = max(f[j], f[j - v[i]] + w[i]);
}
}
cout << f[m];
return 0;
}