#include<fstream>

using namespace std;

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

const int N=5e3;
const int G=1e4;
int prf[G+1];

struct ob
{
    int g;
    int p;
}v[N+1];

int main()
{
    int n, G, maxi=-1;
    in >> n >> G;
    for(int i=0; i<n; i++)
    {
        in >> v[i].g >> v[i].p;
    }
    for(int i=0; i<G; i++)
        prf[i]=-1;
    prf[0]=0;
    for(int i=0; i<n; i++)
    {
        for(int j=G-v[i].g; j>=0; j--)
        {
            if(prf[j]!=-1 && prf[j]+v[i].p > prf[j+v[i].g])
            {
                prf[j+v[i].g]=prf[j] + v[i].p;
            }
        }
    }
    for(int i=1; i<=G; i++)
        if(prf[i]>maxi)maxi=prf[i];
    out << maxi;
    return 0;
}