#include <iostream.h>
#include <math.h>
int main()
{
	long x,y,m,n,L;
	cin>>x>>y>>m>>n>>L;
	
	int i=0;
	
    while (1)
    {
		if (m==n)
		{
			cout<<"Impossible";
			break;
		}
		i++;
		x=(x+m)%L;
		y=(y+n)%L;
		if (x==y)
		{
			cout<<i;
			break;
		}
		else if (i>L/abs(m-n))
		{
			cout<<"Impossible";
			break;
		}
		
    }
	
	return 0;
}