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

#define FOR(i,l,r) for(int i = (int) (l);i < (int) (r);i++)
template<typename T> bool chmax(T& a,const T& b){ return a < b ? (a = b,true) : false; }
template<typename T> bool chmin(T& a,const T& b){ return b < a ? (a = b,true) : false; }
typedef long long ll;

int N,M;
string ok = "Possible",ng = "Impossible";

int main()
{
	scanf("%d%d",&N,&M);

	if(N == 1 && M == 1){
		cout << ok << endl;
	}
	else if(N == 2 && M >= 1 && M <= 3){
		cout << ok << endl;
	}
	else if(N >= 3){
		cout << ok << endl;
	}
	else{
		cout << ng << endl;
	}

	return 0;
}