#include<bits/stdc++.h>
#define int long long
using namespace std;
int w[5],h[5],id[5],W[5],H[5];
signed main(){
	for(int i = 1; i <= 4; i++) scanf("%lld %lld",&w[i],&h[i]),id[i] = i;
	do{
		for(int s = 0; s < 16; s++){
			for(int u = 1; u <= 4; u++){
				int i = id[u];
				W[i] = w[i],H[i] = h[i];
				if(s & (1LL << (u - 1))) swap(W[i],H[i]);
			}	
			if(W[1] + W[3] != W[2] + W[4] || H[1] + H[2] != H[3] + H[4] || W[1] + W[3] != H[1] + H[2]) continue;
			if(W[1] == W[2] || H[1] == H[3]){
				printf("1");
				return 0;
			}
		}
	}
	while(next_permutation(id + 1,id + 5));
	printf("0");
    return 0;
}