#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define x first
#define y second

using namespace std;

typedef long double ld;
typedef long long ll;

int width[7], height[7];

vector <int> comb(int a, int b, int side)
{
	vector <int> res;
	if (height[a] == height[b] && width[a] + width[b] == side) res.pb(height[a]);
	if (height[a] == width[b] && width[a] + height[b] == side) res.pb(height[a]);
	if (width[a] == height[b] && height[a] + width[b] == side) res.pb(width[a]);
	if (width[a] == width[b] && height[a] + height[b] == side) res.pb(width[a]);
	return res; 	
}

int main()
{
 	//freopen("input.txt", "r", stdin);
 	//freopen("output.txt", "w", stdout);
	ios_base::sync_with_stdio(0); cin.tie(0);

	int s = 0;
	for (int i = 1; i <= 4; i++)
	{
	 	int w, h;
	 	cin >> w >> h;
	 	if (w < h) swap(w, h);

	 	width[i] = w, height[i] = h;
	 	s += w * h;
	}

	int side = sqrt(s);
	while (side * side > s) side--;
	while ((side + 1) * (side + 1) <= s) side++;

	if (side * side != s) cout << "0\n", exit(0);

	int other = side;
	for (int i = 1; i <= 4; i++)
	{
	 	if (width[i] > side) cout << "0\n", exit(0);
	 	if (width[i] == side) other -= height[i];
	}
	if (other == 0) cout << "1\n", exit(0);
	
	if (other != side)
	{
    	int kol = 0;
    	for (int i = 1; i <= 4; i++)
    	{
    	 	if (width[i] != side) kol++;
    	}

    	int sum = 0;
    	for (int i = 1; i <= 4; i++)
    	{
    	 	if (width[i] == side) continue;
    	 	
    	 	if (height[i] == other) sum += width[i];
    	 	else if (width[i] == other) sum += height[i];
    	 	else if (kol != 3) cout << "0\n", exit(0);
    	}
    	if (sum == side) cout << "1\n", exit(0);
    	else if (kol != 3) cout << "0\n", exit(0);

    	int len = 0;
    	for (int i = 1; i <= 4; i++)
    	{
    	 	if (width[i] == side) continue;
    	 	if (width[i] == other || height[i] == other) continue;
    	 	if (height[i] == side - sum) len += width[i];
    	 	else if (width[i] == side - sum) len += height[i];
    	 	else cout << "0\n", exit(0);
    	}
    	if (len == other) cout << "1\n", exit(0);
    	else cout << "0\n", exit(0);
    }

	for (int i = 2; i <= 4; i++)
	{
		vector <int> A = comb(1, i, side);

		int x = -1, y = -1;
		for (int j = 2; j <= 4; j++)
			if (j != i) x = y, y = j;

		vector <int> B = comb(x, y, side);

	 	for (int p : A)
	 		for (int q : B)
	 			if (p + q == side) cout << "1\n", exit(0);
	}
	cout << "0\n";
	return 0;
}