#include<bits/stdc++.h>
using namespace std;
#define int long long

int x,y,m,n,l;

int p = 0,q = 0,pp = 0,qq = 0;
void exgcd(int a,int b) {
	if (b == 0) {
		p = 1,q = 0;
	} else {
		exgcd(b,a % b);
		pp = p,qq = q;
		p = qq,q = pp - qq * (a / b);
	}
}

signed main() {
	cin >> x >> y >> m >> n >> l;
	x %= l,y %= l,m %= l,n %= l;
	if (m < n) {
		swap(m,n); 
		swap(x,y);
	}
	int c1 = m - n;
	int c2 = y - x;
	c1 = (c1 % l + l) % l;
	c2 = (c2 % l + l) % l;
	
	int g = __gcd(c1,c2);
	c1 /= g,c2 /= g; 
	if (__gcd(c1,l) != 1) {
		cout << "Impossible";
		exit(0);
	}
	exgcd(c1,l);
	p = (p % l + l) % l;
	cout << ((p * c2) % l + l) % l;
	return 0;
}