#include<fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
inline int max(int a,int b)
{
    if(a>b)
        return a;
    return b;
}
int n,g,p,w,a[2][100010],l;
int main()
{
    in>>n>>g;
    for(int i=1;i<=n;i++)
    {
        in>>w>>p;
        for(int j=1;j<=g;j++)
            if(j<w)
                a[1-l][j]=a[l][j];
            else a[1-l][j]=max(a[l][j],a[l][j-w]+p);
        l=1-l;
    }
    out<<a[n][g]<<'\n';
    out.close();
    return 0;

}