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

#define int long long

int get_height(vector<pair<int, int>> a, int side) {
	int ans1 = 0, ans2 = 0;
	for (auto [x, y]: a) {
		if (x == a[0].first) {
			ans1 += y;
		} else if (y == a[0].first) {
			ans1 += x;
		} 

		if (x == a[0].second) {
			ans2 += y;
		} else if (y == a[0].second) {
			ans2 += x;
		}
	}

	if (ans1 == side) return a[0].first;
	if (ans2 == side) return a[0].second;
	return -1;
}

void dfs(int msk, vector<pair<int, int>> a, int hei, int side) {
	if (msk == 15) {
		cout << "1\n";
		exit(0);
	}

	for (int i = 0; i < 15; i++) {
		if ((msk & i) != 0) continue;

		vector<pair<int, int>> pp;
		for (int j = 0; j < 4; j++) {
			if (i & (1 << j)) pp.push_back(a[j]);
		}

		int h = get_height(pp, side);
		if (h != -1) {
			dfs(msk | i, a, hei+h, side);
		}
	}
}

signed main() {
	ios::sync_with_stdio(0); cin.tie(0);

	vector<pair<int, int>> a(4);
	for (int i = 0; i < 4; i++) {
		cin >> a[i].first >> a[i].second;
	}

	int area = 0;
	for (auto [x, y]: a) {
		area += x*y;
	}

	int side = sqrtl(area);
	if (side*side != area) {
		cout << "0\n";
		return 0;
	}

	for (auto [x, y]: a) {
		if (x > side || y > side) {
			cout << "0\n";
			return 0;
		}
	}

	dfs(0, a, 0, side);
	cout << "0\n";

	return 0;
}