#include <fstream>

using namespace std;

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

int n,g,D[10010],i,j,p[5010],w[5010];

int main()
{
    fin>>n>>g;
    for( i = 1 ; i <= n ; i++ )
    {
        fin>>w[ i ]>>p[ i ];
    }

    for( i = 1 ; i <= n ; i++ )
    {
        for( j = g - w[ i ] ; j >= 0 ; j-- )
        {
            if( D[ j ] + p[ i ] > D[ j + w[ i ] ] )
                D[ j + w[ i ] ] = D[ j ] + p[ i ];
        }
    }

    fout<<D[ g ];

return 0;
}