> 
> #include <iostream.h>
> int main()
> {
> 	long x,y,m,n,l,i,s;
> 	i=1;
> 	cin>>x>>y>>m>>n>>l;
> 	s=x-y;
>     while (x-y+i*(m-n)%l!=s)
> 	{
> 		i++;
> 		if ((x+i*m)%l==(y+i*n)%l)
> 		{
> 			cout<<i;
> 			break;
> 		}
> 		
> 	}
> 	if (x-y+i*(m-n)%l==s) cout<<"Impossible"<<"\n";
>     return 0;
> }