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