#include  <iostream>
#include  <fstream>

using namespace std;

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

int n,GMax,
    G[1001],
    V[1001],
    C[1001][10001];

int main()
{
  in>>n>>GMax;
  for(int  i = 1; i <= n; i++)
    in>>G[i]>>V[i];
  for(int i = 1; i <= n; i++)
    for(int j = 1; j <= GMax; j++)
      if(G[i] > j)
        C[i][j] = C[i-1][j];
      else
        C[i][j] = max(C[i-1][j], V[i] + C[i-1][j-G[i]]);
  out<<C[n][GMax];
}