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


int main() {
    int n,x1,y1,x2,y2;
    cin>>n>>x1>>y1>>x2>>y2;
    if(x1==x2&&y1==y2)
        cout<<"0";
    else if(x1==x2)
        if((abs(y2-y1))%2==0)
            cout<<"Impossible";
    else if(y1==y2)
        if((abs(x1-x2)%2==0))
            cout<<"Impossible";
    return 0;
}