#include <iostream>
#include <set>
#include <vector>
using namespace std ;
using ll = long long ;
using rect = pair<ll, ll> ;
vector<rect> inp ;
vector<set<rect>> bybits(16) ;
int main() {
   rect r ;
   for (int i=0; i<4; i++) {
      cin >> r.first >> r.second ;
      bybits[1<<i].insert(r) ;
      if (r.first != r.second)
         bybits[1<<i].insert({r.second, r.first}) ;
   }
   for (int bm=1; bm<16; bm++) {
      for (int s1=1; s1<16; s1++) {
         if ((bm & s1) != s1)
            continue ;
         int s2 = bm - s1 ;
         if (s2 == 0)
            continue ;
         for (auto r1: bybits[s1])
            for (auto r2: bybits[s2])
               if (r1.first == r2.first) {
                  bybits[bm].insert({r1.first, r1.second + r2.second}) ;
                  bybits[bm].insert({r1.second + r2.second, r1.first}) ;
               }
      }
   }
   int goodcnt = 0 ;
   for (auto r1: bybits[15])
      if (r1.first == r1.second)
         goodcnt = 1 ;
   cout << goodcnt << endl ;
}