#include <iostream>
#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");

int op[10005], w[10005], p[10005], s, n, g;




int main()
{
    in>>n>>g;
    for(int i=1;i<=n;i++){
        in>>w[i]>>p[i];
    }


    for(int i=1;i<=n;i++){
        for(int j=g-w[i];j>=0;j--){
            if(op[j+w[i]]< op[j]+p[i]){

                op[j+w[i]]=op[j]+p[i];
                if(op[j+w[i]]>s){
                    s=op[j+w[i]];
                }
            }
        }
    }

    cout<<s;

}