/**
 *    author:  math2do
 *    created: 18.01.2020 12:32:36
**/

#include <bits/stdc++.h>

using namespace std;

template <typename A, typename B>
string to_string(pair<A, B> p);
 
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);
 
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);
 
string to_string(const string& s) {
  return '"' + s + '"';
}
 
string to_string(const char* s) {
  return to_string((string) s);
}
 
string to_string(bool b) {
  return (b ? "1" : "0");
}
string to_string(const char &ch) {
  return string(1, ch);
}
 
string to_string(vector<bool> v) {
  bool first = true;
  string res = "{";
  for (int i = 0; i < static_cast<int>(v.size()); i++) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(v[i]);
  }
  res += "}";
  return res;
}
 
template <size_t N>
string to_string(bitset<N> v) {
  string res = "";
  for (size_t i = 0; i < N; i++) {
    res += static_cast<char>('0' + v[i]);
  }
  reverse(res.begin(), res.end());
  return res;
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}
 
template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
 
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}
 
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}

//..import matrix, queue, stack
template <typename T> 
string to_string(vector <vector<T>> &mat) {
  string res = "";
  char temp[32];
  int n = mat.size();
  if (n == 0) return res;
  res += "\n";
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < (int) mat[i].size(); j++) {
      sprintf(temp, "%15s", to_string(mat[i][j]).c_str());
      res += string(temp);
    }
    res += "\n";
  }
  return res;
}


void debug_out() { cerr << endl; }
 
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}
 
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif


int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n, W;
  cin >> n >> W;
  vector <int> w(n), v(n);
  for (int i = 0; i < n; i++) {
    cin >> w[i] >> v[i];
  }
   
  vector <vector <long long>> dp(n, vector <long long>(W + 1, 0));
  for (int j = w[0]; j <= W; j++) {
    dp[0][j] = v[0];
  } 
  
  for (int i = 1; i < n; i++) {
    for (int j = 0; j <= W; j++) {
      if (j >= w[i]) {
        dp[i][j] = max(dp[i][j], max(dp[i - 1][j], v[i] + dp[i - 1][j - w[i]]));
      } else {
        dp[i][j] = max(dp[i][j], dp[i - 1][j]);
      } 
    }
  }     

  debug(dp);

  cout << dp[n - 1][W] << '\n';
  return 0;
}


Measured memory_bytes: 79488