#include <bits/stdc++.h>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main() {
  int n, m;
  fin >> n >> m;
  vector<int> collumn1(m + 1, 0);
  for (int i = 1; i <= n; i++) {
    int w, p;
    vector<int> collumn2(m + 1, 0);
    fin >> w >> p;
    collumn2[w] = max(collumn1[w], p);
    for (int j = 0; j <= m; j++) {
      collumn2[j] = max(collumn2[j], collumn1[j]);
      if (j + w <= m)
        collumn2[j + w] = max(collumn1[j + w], collumn1[j] + p);
    }
    collumn1.assign(collumn2.begin(), collumn2.end());
  }
  int ans = 0;
  for (int i = 0; i <= m; i++)
    ans = max(ans, collumn1[i]);
  fout << ans;
}