#include <iostream>
#include <fstream>
#define NRMAX 5005
#define GMAX 10005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int N,G;
int cmax[GMAX];
int c[NRMAX],g[NRMAX];

void citire();
void pd();
int main()
{

    citire();
    pd();
    fout<<cmax[G]<<'\n';
    return 0;
}

void citire()
{
    int i;

    fin>>N>>G;

    for(i=1;i<=N;i++)
        fin>>g[i]>>c[i];
}
void pd()
{int i,x;

     for(i=1;i<=N;i++)
        for(x=G;x>=1;x--)
            if(x>=g[i])
            if(cmax[x]<c[i]+cmax[x-g[i]])
            cmax[x]=c[i]+cmax[x-g[i]];
}