#include <bits/stdc++.h>
using namespace std;
int main(){
  int N, I;
  cin >> N >> I;
  vector<int> s(N), a(N);
  for (int i = 0; i < N; i++){
    cin >> s[i] >> a[i];
  }
  vector<int> dp(I + 1, 0);
  for (int i = 0; i < N; i++){
    for (int j = I - s[i]; j >= 0; j--){
      dp[j + s[i]] = max(dp[j + s[i]], dp[j] + a[i]);
    }
  }
  cout << dp[I] << endl;
}