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

int main()
{
	int N, M;
	cin >> N >> M;
	bool res;
	if (N == 1) {
		res = M == 1;
	}
	else if (N == 2) {
		res = M >= 1;
	}
	else if (N == 3) {
		res = M != 3;
	}
	else {
		res = true;
	}
	cout << (res ? "Possible" : "Impossible") << endl;
	return 0;
}