#include <bits/stdc++.h>

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n,gm,d[10005],w[5005],p[5005],ans;
int main()
{
    in>>n>>gm;
    for(int i=1;i<=n;i++)
        in>>w[i]>>p[i];
    for(int i=1;i<=n;i++)
    {
        for(int j=gm;j-w[i]>=0;j--)
        {
            d[j]=max(d[j],d[j-w[i]]+p[i]);
            ans=max(ans,d[j]);
        }
    }
    out<<ans;
    return 0;
}