import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
 public static void printShortestPath(int N, int Is,int Js,int Ie,int Je)
    {
        if((Je-Ie)%2!=0)
        System.out.println("Impossible");
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int is = in.nextInt();
        int js = in.nextInt();
        int ie = in.nextInt();
        int je = in.nextInt();
        printShortestPath(n, is, js, ie, je);
        
        in.close();
    }
  
}