#include <iostream>
#include <fstream>

using namespace std;

int n,g,a[5005],cost,greutate;

int main()
{
    ifstream fin("rucsac.in");
    fin>>n>>g;
    for(int i=0;i<n;i++)
    {
        fin>>greutate>>cost;
        for(int j=g;j>=greutate;j--)
            a[j]=max(a[j],a[j-greutate]+cost);
    }
    ofstream fout("rucsac.out");
    fout<<a[g];
    return 0;
}