#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#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;

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  int ans = 2;
  if (a == c || b == d) ans = 1;
  if (abs(a - c) + abs(b - d) <= 3) ans = 1;
  cout << ans << endl;
  return 0;
}