#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int n, g, w[5001], p[5001], dp[10001];

int main()
{
    fin>>n>>g;
    for (int i=1; i<=n; i++)
    {
        fin>>w[i]>>p[i];
    }
    for (int i=1; i<=n; i++)
    {
        for (int cw=G; cw>=w[i]; cw--)
        {
            dp[cw]=max(dp[cw], dp[cw-w[i]]+p[i]);
        }
    }
    fout<<dp[g]
    

    return 0;
}