#include <fstream>

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int i,j,n,Wmax,W[5010],P[5010];
int D[10010],ans;

int main()
{
    fin>>n>>Wmax;
    for( i = 1 ; i <= n ; i++ )
    {
        fin>>W[ i ]>>P[ i ];
    }

    for( i = 1 ; i <= n ; i++ )
    {
        for( j = Wmax - W[ i ] ; j >= 0 ; j-- )
        {
            if( D[ j + W[ i ] ] < D[ j ] + P[ i ] )
            {
                D[ j + W[ i ] ] = D[ j ] + P[ i ];
            }
        }
    }

    fout<<D[ Wmax ];

    return 0;
}