#include <iostream>
#include <fstream>
using namespace std;
int v[10005],n,g,w[5001],p[5001];
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int rucsac()
{
    int i,j;
    for (i=1;i<=n;i++)
        for (j=g;j>=w[i];j--)
            v[j]=max(v[j],v[j-w[i]]+p[i]);
    return v[g];
}
int main()
{
    int i;
    fin>>n>>g;
    for (i=1;i<=n;i++)
        fin>>w[i]>>p[i];
    fout<<rucsac();
    fin.close();
    fout.close();
    return 0;
}