#include <bits/stdc++.h>

using namespace std;

struct cell
{
    int x, y;
    int dis;
    cell() {}
    cell(int x, int y, int dis) : x(x), y(y), dis(dis) {}
};
 
bool isInside(int x, int y, int N)
{
    if (x >= 1 && x <= N && y >= 1 && y <= N)
        return true;
    return false;
}
 
int minStepToReachTarget(int N, int kx, int ky, int tx, int ty)
{
    int dx[] = {-2, -1, 1, -1, 1, 2};
    int dy[] = {0, -2, -2, 2, 2, 0};
 
    queue<cell> q;
 
    q.push(cell(kx,ky, 0));
 
    cell t;
    int x, y;
    bool visit[N + 1][N + 1];
 
    for (int i = 1; i <= N; i++)
        for (int j = 1; j <= N; j++)
            visit[i][j] = false;
 
    visit[kx][ky] = true;
 
    while (!q.empty())
    {
        t = q.front();
        q.pop();
        visit[t.x][t.y] = true;
 
        if (t.x == tx && t.y == ty)
            return t.dis;
 
        for (int i = 0; i < 6; i++)
        {
            x = t.x + dx[i];
            y = t.y + dy[i];
 
            if (isInside(x, y, N) && !visit[x][y])
                q.push(cell(x, y, t.dis + 1));
        }
    }
    return -1;
}



int main() {
    int n;
    cin >> n;
    int i_start;
    int j_start;
    int i_end;
    int j_end;
    cin >> i_start >> j_start >> i_end >> j_end;
    int t = minStepToReachTarget(n, i_start, j_start, i_end, j_end);
    if(t==-1)
        cout<<"Impossible";
    else
        cout<<t;
    return 0;
}