#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,x,y,a,b;
    cin>>n>>x>>y>>a>>b;
    if(abs(x-a)%2!=0)cout<<"Impossible";
    else
        cout<<2;
    return 0;
}