> #include<iostream>
> using namespace std;
> int main()
> {
>     __int64 x,y,m,n,l,v_c,s_c,w,num,i;
>     int flag;
>     while(cin>>x>>y>>m>>n>>l)
>     {
>     num=0;
>     flag=0;
>     x=x%l;
>     y=y%l;
>     if(x<0)
>     x=x+l;
>     if(y<0)
>     y=y+l;
>     if(x==y)
>     {
>         cout<<0<<endl;
>         continue;
>     }
>     if(m==n)
>     {
>         cout<<"Impossible"<<endl;
>         continue;
>     }
>     else if(m>n)
>     v_c=m-n;
>     else
>     v_c=n-m;    
>     if(x>y&&m>n)
>     s_c=l-x+y;
>     else if(x>y&&m<n)
>     s_c=x-y;
>     else if(x<y&&m>n)
>     s_c=y-x;
>     else if(x<y&&m<n)
>     s_c=l-y+x;    
>     for(i=0;i<1000000;i++)
>     {
>         w=s_c%v_c;
>         num+=s_c/v_c;
>         if(w==0)
>         {
>             flag=1;
>             break;   
>         }
>         else
>         {
>             s_c=l-v_c+w;
>             num++;
>         }
>     }
>     if(flag==1)
>     cout<<num<<endl;
>     else
>     cout<<"Impossible"<<endl;
>     }
>     return 0;
> }