#include <bits/stdc++.h>
#define DIM 10001

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int n, G;
int C[DIM], gr, c;

void solve()
{
    f>>n>>G;
    for (int i=1; i<=n; i++)
        {
            f>>gr>>c;
            for (int j=G; j>=gr; j--)
                if (C[j]<C[j-gr]+c)
                    C[j]=C[j-gr]+c;
        }
    g<<C[G]<<'\n';
    f.close();
    g.close();
}

int main()
{
    solve();
    g.close();
    return 0;
}