#include <iostream>
#include <fstream>
#define N 5010
#define W 10010

using namespace std;

ifstream f("rucsac.in");
ofstream g1("rucsac.out");

int a[N][W],i,j,g,n,m,l=0,v[N],w[N],k,t;

int main()
{
    f>>n>>g;
    for(i=1;i<=n;i++)
    {
        f>>w[i]>>v[i];
    }
    for(i=1;i<=n;++i,l=1-l)
    {
    for(j=0;j<=g;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]]+v[i]);
        }
    }
    }
    g1<<a[l][g];
}