#include<iostream>
#include<string.h>
#include<algorithm>
#include<vector>
#include<math.h>
#include<iomanip>
using namespace std;
int main()
{
    long long n,m,p,q;
    cin>>n>>m>>p>>q;
    if(p*q<=n*m)
        cout<<"Program ends with return value 0.";
    else
        cout<<"Segmentation fault.";
    return 0;
}