#include <fstream>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int v[2][10002],n,g;
int main()
{
    fin>>n>>g;
    for (int i=1;i<=n;i++)
    {
        int x,y;
        fin>>y>>x;
        for (int j=y;j<=g;j++)
            v[i%2][j]=max(x+v[(i+1)%2][j-y],max(v[(i+1)%2][j],v[i%2][j-1]));

    }
    fout<<v[n%2][g];
    return 0;
}