#include<fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");

int W[10001],P[10001],sol[2][10001],G,N,i,j,l;

int main()
{

    in>>N>>G;
    for(i = 1 ; i <= N ; i++)
        in>>W[i]>>P[i];
    for(i = 1 ; i <= G ; i++)
    {
        l = 1-l;
        for(j = 0 ; j <= G ; j++)
    {

        sol[1-l][j] = sol[l][j];
        if(W[i] <= j)
            sol[1-l][j] = max(sol[1-l][j],sol[l][j-W[i]]+P[i]);
    }
    }
    out<<sol[l][G];
    return 0;
}