//============================================================================
// Name        : main1061.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
using namespace std;

long long int NI(long long int p, long long int q){
	//p对q的逆
	if(p > q) return NI(p%q, q);
	if(p == 1 || q == 1) return 1;
	int y = NI(q%p, p);
	int ans = ((q*y-1)/p)%q;
	return q-ans;
}

long long int GCD(long long int a, long long int b){
	if(a == 0) return b;
	if(b == 0) return a;
	if(a == 1 || b == 1) return 1;
	if(a <= b) return GCD(a, b%a);
	return GCD(b, a%b);
}

long long int solve(long long int a, long long int b, long long int M){
	a %= M; b %= M;
	if(a < 0) a += M;
	if(b < 0) b += M;
	long long int gcd = GCD(a, M);
	if(b%gcd != 0) return -1;
	a /= gcd;
	M /= gcd;
	b /= gcd;
	long long int ni = NI(a, M);
	return (ni * b) % M;
	//return 0;
}

int main() {
	long long int x, y, m, n, L;
	cin >> x >> y >> m >> n >> L;
	long long int res = solve(m-n, y-x, L);
	if(res == -1) cout << "Impossible" << endl;
	else cout << res << endl;
	//cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
	return 0;
}