#include <bits/stdc++.h>
  ifstream fin("rucsac.in");
    ofstream fout("rucsac.out");
using namespace std;
int N, G, Pmax;
bool u;
int W[5000], P[5000];
int D[2][5000];
 int main()
{ 
    fin >> N >> G;
    for(int i = 1; i <= N; ++i)
        fin >> W[i] >> P[i];
      for(int i = 1; i <= N; ++i){
        for(int cw = 0; cw <= G; ++cw)
        {
        D[u][cw] = D[!u][cw];
        if(W[i] <= cw)
        D[u][cw] = max(D[u][cw], D[!u][cw - W[i]] + P[i]);            
        }
        u = !u;
    }
    u = !u;
    Pmax = D[u][G];
    fout << Pmax;
    return 0;
}