#include<fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,m,i,j,gm,rez,t,gc,k,l,a[5002][10002];

int main()
{
    f>>n>>gm;
    for(t=1;t<=n;t++)
    {
        f>>gc>>k;
         i++;
         a[i][gc]=k;
        for(j=1;j<=gm;j++)
        {
            if(a[i-1][j]!=0)
            {
                a[i][j+gc]=max(a[i-1][j]+k,a[i][j+gc]);
                if(a[i][j]==0) a[i][j]=a[i-1][j];
                else a[i][j]=max(a[i-1][j],a[i][j]);
            }
            if(a[i][j]>rez) rez=a[i][j];
        }
    }
/*
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=gm;j++)
        g<<a[i][j]<<" ";
        g<<"\n";
    }
*/
    g<<rez;
    return 0;
}