#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream afis("rucsac.out");
int n,g,i,w[5001],p[5001],m[10001],j,ma;
int main()
{
f>>n>>g;
for (i=1;i<=n;i++)
{
    f>>w[i]>>p[i];
}
m[w[1]]=p[1];



for (i=2;i<=n;i++)
{

    for (j=g-w[i];j>=0;j--)
    {

         m[j+w[i]]=max(m[j+w[i]],m[j]+p[i]);


    }

}
ma=0;
for (i=0;i<=g;i++)
    ma=max(ma,m[i]);
afis<<ma;




    return 0;
}