#include <fstream>

using namespace std;

int x[5001],y[5001],l[5001];

int main()
{
    int n,i,j,c,tit,tud,op,ap,max;
    ifstream f("rucsac.in");
    ofstream g("rucsac.out");
    f>>n>>op;
    for(i=1;i<=n;i++)
    {
        f>>l[i]>>x[i];
        for(j=op;j>=0;j--)
        if(y[j]>0&&j+l[i]<=op)
        if(x[i]+y[j]>y[j+l[i]])
        y[j+l[i]]=x[i]+y[j];
        if(y[l[i]]<x[i])
        y[l[i]]=x[i];

    }
    max=0;
    for(i=1;i<=op;i++)
    if(y[i]>max)
    max=y[i];
    g<<max;

    f.close();
    g.close();
    return 0;
}