#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int a[5010][10010], gr[5010], p[5010] , n, gmax, i, j, maxx, x;  /// gr[]=greutatea, p[]=pret

int main()
{
    fin>>n>>gmax;
    for(i=1; i<=n; i++)
    {
        fin>>gr[i]>>p[i];
    }
    for(i=1; i<=n; i++)
    {
        for(j=1; j<=gmax; j++)
        {
            if( j-gr[i]<0 )
                x=a[i-1][j];
            else
            {
                if( a[i-1][j] > a[i-1][j-gr[i]]+p[i] )
                    x = a[i-1][j];
                else
                    x = a[i-1][j-gr[i]]+p[i];
            }
            a[i][j]=x;
        }
    }
    fout<<a[n][gmax];

    fin.close();
    fout.close();
    return 0;
}