#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

#include <atcoder/math>

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  pair<ll, ll> ans = atcoder::crt({ b, d }, { a, c });
  if (ans.second == 0) {
    cout << "NaN" << endl;
  }
  else {
    cout << ans.first << endl;
  }
  return 0;
}