#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

bool solve(int N, int M){
  if(N <= 2){
    if(M==0) return false;
    else return true;
  }
  return true;
}


int main(){
  int N, M;
  cin >> N >> M;

  if(solve(N, M)) cout << "Possible" << endl;
  else cout << "Impossible" << endl;

  return 0;
}