#include<bits/stdc++.h>
// #include<atcoder/all>
// #include<boost/multiprecision/cpp_int.hpp>

using namespace std;
// using namespace atcoder;
// using bint = boost::multiprecision::cpp_int;
using ll = long long;
using ull = unsigned long long;
using P = pair<int,int>;
#define rep(i,n) for(ll i = 0;i < (ll)n;i++)
#define ALL(x) (x).begin(),(x).end()
#define MOD 1000000007
// #define MOD 998244353


int main(){
  
  int n,I;
  cin >> n >> I;
  vector<P> v(n);
  rep(i,n)cin >> v[i].first >> v[i].second;
  vector<ll> dp(I+1,-MOD);
  dp[0] = 0;
  rep(i,n){
    vector<ll> DP(I+1,-MOD);
    rep(j,I+1){
      if(j+v[i].first <= I)DP[j+v[i].first] = max(DP[j+v[i].first],dp[j] + v[i].second);
      DP[j] = max(DP[j],dp[j]);
    }
    swap(dp,DP);
  }
  cout << *max_element(ALL(dp)) << "\n";
  

  return 0;
}