#include <iostream>
#include <fstream>

using namespace std;

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

int n,G;
int v[1005];

struct obiect
{
    int g,c;
};

obiect a[1005];

int main()
{
    int i,j,maxim=0;
    in>>n>>G;
    for(i=1; i<=n; i++)
    {
        in>>a[i].g>>a[i].c;
    }
    for(i=1; i<=n; i++)
        for(j=G-a[i].g ; j>=0; j--)
        {
            v[j+a[i].g]=max(v[j]+a[i].c , v[j+a[i].g ]);
            if(v[j+a[i].g]>maxim)
                maxim=v[j+a[i].g];
        }
    out<<maxim;
    return 0;
}