#include <bits/stdc++.h>
using namespace std;

pair <int, int> PU[9], p[9];
int bo[9];
int area = 0;
int side = 0;

void rec(int q){
    if(q > 4){
        if(p[1].first + p[3].first != side) return;
        if(p[1].second + p[2].second != side) return;
        if(p[3].second + p[4].second != side) return;
        if(p[2].first + p[4].first != side) return;
        cout << 1;
        exit(0);
        return;
    }

    for(int i = 1; i <= 4; i++){
        if(bo[i]) continue;
        bo[i] = 1;
        p[q] = PU[i];
        rec(q + 1);
        bo[i] = 0;
    }
}

int main(){
    ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    for(int i = 1; i <= 4; i++){
        cin >> PU[i].first >> PU[i].second;
        area += PU[i].first * PU[i].second;
    }

    side = sqrt(area);
    if(side * side != area){
        cout << 0;
        return 0;
    }

    rec(1);
    cout << 0;
    return 0;
}