// oj.cpp : 定义控制台应用程序的入口点。
//

#include <iostream>
using namespace std;
int main()
{   
	int x,y,m,n,L; 
	int sm,sn,jn,ok,im;

	//while(1) {
	cout<<" Please input x y m n L"<<endl;
	cin >> x >> y>>m>>n>>L;
	//while (x==y||x>2000000000||x<=0||y>2000000000||y<=0||m<=0||m>=2000000000||n<=0||n>=2000000000||L<=0||L>=2100000000) 
	//{
	//	cout<<" The data is incorrect, please input x y m n L"<<endl;
	//	cin >> x >> y>>m>>n>>L;
	//}
	ok=0;
	jn=0;
	x=x%L;
    y=y%L;
	//if(x==y){
	//	ok=1;
	//}
	sm=x;
	sn=y;
	im=0;
	if(sm!=sn&&m==n&&ok==0){
		im=1;
	}
	while (ok==0&&im==0)
	{
		jn++;
		sm=(sm+m)%L;
		sn=(sn+n)%L;
		if(sm!=sn&&sm==x&&sn==y) {
			im=1;
			break;
		}
		//cout<<"sm = "<<sm<<" ; sn = "<<sn<<endl;
		if(sm==sn) {
			ok=1;
		} else {
			ok=0;
		}
	}
	if(im==0&&ok==1) {
	cout<<jn<<endl;
	} else
	{
		cout<<"Impossible"<<endl;
	}
	//}

	//cin.get();
	return 0;
}