#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstring>

using namespace std;

int n,G,w[5010],p[5010], A[10010], B[10010];

void Citire();
void Afisare();
void Rezolvare();
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int main()
{
    Citire();
    Rezolvare();
    Afisare();
    return 0;
}

void Citire()
{
    fin>>n>>G;
    for(int i=1;i<=n;++i)
        fin >> w[i]>>p[i];
    fin.close();
}
void Rezolvare(){
    int p1, p2;
    for(int i=1;i<=n;++i){
        for(int g=1;g<=G;++g){
            p1 = A[g];
            p2 = 0;
            if( g>=w[i])
                p2 = A[g-w[i]]+p[i];
            B[g] = p1>p2?p1:p2;
        }
        memcpy(A,B,sizeof(B));
    }
}

void Afisare()
{
    fout << A[G];
    fout.close();
}