#include <bits/stdc++.h>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
struct obiect
{
    int w,p;
} v[5005];
int n,g,sol[10005],last=0,i,j;
int main()
{
    in>>n>>g;
    for( i=1; i<=n; i++)
        in>>v[i].w>>v[i].p;
    for( i=1; i<=n; i++)
        for( j=g-v[i].w; j>=0; j--)
            if(sol[j+v[i].w] < sol[j]+v[i].p)
            {
                sol[j+v[i].w]=sol[j]+v[i].p;
                if(sol[j+v[i].w] > last)
                    last = sol[j+v[i].w];
            }
    out<<last;
    return 0;
}