#include <iostream>
#include <fstream>

using namespace std;

ifstream in("energii.in");
ofstream out("energii.out");

#define MAXG 10001
#define MAXN 5002

int w[MAXN];
int p[MAXN];
int sol[MAXG];
int n,s,rez=0;

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

    sol[0]=1;

    for(int i=1; i<=n; i++)
    {
        for(int j=s-w[i]; j>=0; j--)
        {
            if(sol[j+w[i]]<sol[j]+p[i])
            {
                sol[j+w[i]]=sol[j]+p[i];
                if(sol[j]+p[i]>rez)
                    rez=sol[j]+p[i];
            }
        }

    }
    out<<rez-1;
}