#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

bool solve() {
	int n, m;
	std::cin >> n >> m;

	if (n == 1) return m == 1;
	if (n == 2) return m != 0;
	return true;
}

int main() {
	puts(solve() ? "Possible" : "Impossible");
}