#include <iostream>
#include <fstream>
using namespace std;
int n,G,g[5002],v[5002],d[2][10002],i,j,mx,ic,ip;
int main()
{
    ifstream fin ("rucsac.in");
    ofstream fout ("rucsac.out");
    fin>>n>>G;
    for(i=1;i<=n;i++)
    {
        fin>>g[i]>>v[i];
    }
    for(i=0;i<=n;i++)
    {
        ic=i%2;
        ip=1-ic;
        for(j=0;j<=G;j++)
        {
            d[ic][j]=max(d[ic][j],d[ip][j]);
            if(j+g[i]<=G)d[ic][j+g[i]]=d[ip][j]+v[i];
            if(d[ic][j]>mx)mx=d[ic][j];
        }
    }
    fout<<mx;
    return 0;
}