#include<bits/stdc++.h>
#define int long long 
using namespace std;
int s1,s2;
void exgcd(int a,int &x,int b,int &y){
	if(b==0){
		x=1,y=0;
		return;
	}
	exgcd(b,x,a%b,y);
	int t=x;
	x=y;
	y=t-(a/b)*y;
}
signed main(){
	int x,y,n,m,l;
    cin>>x>>y>>m>>n>>l;
	int A=n-m,B=x-y;
	if(A<0){
		A=-A;
		B=-B;
	}
	int g=__gcd(A,l);
	exgcd(A,s1,l,s2);
	if(B%g!=0){
		cout<<"Impossible";
		return 0;
	}
	cout<<((s1*(B/g))%(l/g)+(l/g))%(l/g);
}