#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

constexpr int M = 1000 * 1000 + 10;
int dp[M];

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, w;
  cin >> n >> w;
  int vbest, wbest;
  rep(i, n) {
    int v, w;
    cin >> v >> w;
    if (i == 0 || v * wbest > vbest * w) vbest = v, wbest = w;
    rep(i, M - w) chmax(dp[i+w], dp[i] + v);
  }
  ll ans = 0;
  rep(i, min(M, w + 1)) {
    chmax(ans, dp[i] + ll(w - i) / wbest * vbest);
  }
  cout << ans << '\n';
}