#include<iostream>
using namespace std;

int main()
{
	int x,y,m,n,L;
	while(cin>>x>>y>>m>>n>>L)
	{
		if(m==n)
		{
			cout<<"Impossible"<<endl;
			continue;
		}
		y=y%L;
		x=x%L;
		m=m%L;
		n=n%L;
		if(m<n)
		{
			int t=m;
			m=n;
			n=t;
			t=x;
			x=y;
			y=t;
		}
		
		if(y<x)
			y+=L;
		int a=L%(m-n),b=(y-x)%(m-n);
		for(int i=0;i<m-n;i++)
		{
			if((i*a+b)%(m-n)==0)
			{
				cout<<(i*L+(y-x))/(m-n)<<endl;
				break;
			}
			if(i==m-n-1)
				cout<<"Impossible"<<endl;
		}
	}
	return 0;
}