#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    int n,g,a[5000][10000],i,j,w[100],p[100];
    fin>>n>>g;
    for(i=1;i<=n;++i)
       fin>>w[i]>>p[i];
    for(i=1;i<=n;++i)
       for(j=1;j<=g;++i)
          {
              a[2][j]=a[1][j];

              if(w[i]<=j)
              {
                  a[2][j]=max(a[1][j],a[1][j-w[i]+p[i]]);
              }
          }
          cout<<a[2][g];

    return 0;
}