#include <iostream>
#include <fstream>
#define GMAX 10005
#define NMAX 5003
using namespace std;

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

int n,gr,p[GMAX],g[GMAX],d[2][GMAX];

int main()
{
    in >> n >> gr;
    for(int i=1;i<=n;i++)
    {
        in >> g[i] >> p[i];
    }
    int l=0;
    for(int i=1;i<=n;i++,l=1-l)
    {
        for(int k=1;k<=gr;k++)
        {
            d[1-l][k] = d[l][k];
            if(k-g[i]>=0)
            {
                if(d[1-l][k]< d[l][k-g[i]]+p[i])
                {
                    d[1-l][k] = d[l][k-g[i]]+p[i];
                }
            }
        }
    }
    out << d[l][gr];


    return 0;
}