#include <iostream>
using namespace std;

int main() {
    int N, M, p, q;
    cin >> N >> M >> p >> q;

    if (p < 0 || p >= N || q < 0 || q >= M) {
        cout << "Segmentation fault." << endl;
    } else {
        cout << "Program ends with return value 0." << endl;
    }

    return 0;
}