#include <iostream>
#include <fstream>

#define NMAX 10010
#define GMAX 5010

using namespace std;
ifstream f ("rucsac.in");
ofstream g ("rucsac.out");

int w[NMAX],p[NMAX],i,n,j,a[2][GMAX],gr;

int main()
{
    f >> n >> gr;
    for(i=1; i<=n; i++) f >> w[i] >> p[i];
    int l=0;
    for(i=1; i<=n; i++, l=1-l)
        for(j=0; j<=gr; j++) {
            a[1-l][j]=a[l][j];
            if(w[i]<=j)
                a[1-l][j]=max(a[1-l][j],a[l][j-w[i]]+p[i]);
        }
    g << a[l][gr];
    return 0;
}