> import java.io.*;
> class Main
> {
>   void init() throws Exception
>   {
>     BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
>     String[] number=br.readLine().split(" ");
>     br.close();
>     if (number[2].equals(number[3])) System.out.print("Impossible");
>     else find(Integer.parseInt(number[0]),Integer.parseInt(number[1]),Integer.parseInt(number[2]),Integer.parseInt(number[3]),Integer.parseInt(number[4]));
>   }
>   void find(int x,int y,int m,int n,int l) throws Exception
>   {
>     int k=1;
>     int t=-1;
>     int a=Math.abs(m-n);
>     int b=0-Math.abs(y-x);
>     if ((m>n && x<y) || (m<n && x>y))
>     {
>       k=0;b=Math.abs(b);
>     }
>     if ((b+l*k)%a==0) t=(b+l*k)/a;
>     else
>     {
>       int q=(b+l*k)%a;
>       int qq=l%a;
>       if (qq!=0)
>       {
>         if (q%qq==0) t=(b+l*k)/a+(l/a)*(q/qq);
>       }
>     }
>     if (t<0) System.out.print("Impossible");
>     else show(t);
>   }
>   void show(int t) throws Exception
>   {
>     System.out.print(t);
>   }
>   public static void main(String[] args) throws Exception
>   {
>     Main m=new Main();
>     m.init();
>   }
> }