#include <bits/stdc++.h>
#define GMAX 10005
#define NMAX 5005

using namespace std;

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

int n, G;
int g[NMAX];
int c[NMAX];

int cmax[GMAX];
void citire();
void pd();
int main()
{
    citire();
    pd();
    fout<<cmax[G]<<'\n';
    fout.close();
    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>0; x--)
            if(x>=g[i])
            if(cmax[x]<c[i]+cmax[x-g[i]])
               cmax[x]=c[i]+cmax[x-g[i]];

}