#include <fstream>
#define NMAX 5002
#define GMAX 10002

using namespace std;

int n,G;
int lc=1, lp=0;
int g[NMAX],c[NMAX];
int cmax[2][GMAX];

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

void citire(){

    fin>>n>>G;
    for(int i=1;i<=n;i++)
        fin>>g[i]>>c[i];
}

void pd(){
    for(int i=1;i<=n;i++){
        for(int x=1;x<=G;x++){
            cmax[lc][x]=cmax[lp][x];
            if(g[i]<=x && cmax[lp][x-g[i]]+c[i]>cmax[lc][x])
                cmax[lc][x]=cmax[lp][x-g[i]]+c[i];
        }
        lp=1-lp;
        lc=1-lc;
    }
}

int main()
{
    citire();
    pd();
    fout<<cmax[lp][G]<<'\n';
    return 0;
}