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

using namespace std;

ifstream f("rucsac.in");
ofstream g("ruscac.out");

int w[N],v[N],a[2][N],i,j,n,m,l,we,k,t,p,r;

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