#include <fstream>
#define MAX 5010
#define MAX1 10010
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,G;
int g[MAX];
int c[MAX];
int cmax[MAX1];
void citire();
void pd();
int main()
{
   citire();
   pd();
   fout<<cmax[G];
    return 0;
}
void citire()
{
    int i;
    fin>>n>>G;
    for(i=1;i<=n;i++)
    {
        fin>>g[i];
        fin>>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]];
}