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

int main(){
  int n;
  int m;
  cin>>n>>m;
  if(n==1){
    if(m==0) cout<<"Impossible"<<endl;
    else cout<<"Possible"<<endl;
    return 0;
  }
  if(n==2){
    if(m==2 || m==1){
    cout<<"Possible"<<endl;
    }
    else{
    cout<<"Impossible"<<endl;
    }
    return 0;
  }
  if(n==3){

    cout<<"Possible"<<endl;

    return 0;
  }
  
  cout<<"Possible"<<endl;

  return 0;
}