#include <fstream>

using namespace std;

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

const int N = 10001;

struct obiect{
    int g,p;

}v[N];

int main()
{
    int n,k,profit[N],maxx=-1;
    fin>>n>>k;
    for(int i=0;i<n;i++)
    {
        fin>>v[i].g>>v[i].p;
    }
    for(int i=1;i<=k;i++)
        profit[i]=-1;
    profit[0]=0;
    for(int i=0;i<n;i++)
    {
        for(int j=k-v[i].g; j>=0; j--)
        {
            if(profit[j]!=1 && profit[j] + v[i].p >  profit[j + v[i].g])
                profit[j+v[i].g] = profit[j] + v[i].p;
        }
    }
    for(int i=1;i<=k;i++)
    {
        if(profit[i]>maxx)
            maxx=profit[i];
    }
    fout<<maxx;
    return 0;
}