#include <bits/stdc++.h>

using namespace std;

using lli = int64_t;
using pii = pair<int, int>;
using vint = vector<int>;
using triple = pair<int, pii>;
using C = int;
using P = complex<C>;

const int MX = 505;
const int MOD = 1e9 + 7;

void solve() {
    pii p1, p2;
    cin >> p1.first >> p1.second >> p2.first >> p2.second;

    if (p1.first * p2.first < 0 || p1.second * p2.second < 0) {
        cout << 1;
    } else {
        cout << 0;
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int t = 1;
    // cin >> t;

    while (t--) {
        solve();
        cout << '\n';
    }

    return 0;
}