#include <iostream>
#include <fstream>

using namespace std;

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

const int NMAX = 5002;
const int GMAX = 10002;

int n,s;
int p[NMAX],w[NMAX],sol[GMAX];
int ans=0;

void read()
{
    in>>n>>s;
    for(int i=1;i<=n;i++)
    {
        in>>w[i]>>p[i];
    }
}

void solve()
{

    for(int i=1;i<=n;i++)
    {
        for(int j=s-w[i];j>=0;j--)
        {
            if(sol[j]+p[i]>sol[w[i]+j])
            {
                sol[w[i]+j]=sol[j]+p[i];
                ans=max(ans,sol[w[i]+j]);
            }
        }
    }
}

int main()
{
    read();
    solve();
    out<<ans;
}