#include <algorithm>
#include <cstdio>
#include <iostream>
#include <iomanip>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
int main(){
  int n, m;
  cin >> n >> m;
  if(n == 1 && m != 1){
    cout << "Impossible" << endl;
    return 0;
  }
  if(n == 2 && m == 0){
    cout << "Impossible" << endl;
    return 0;
  }

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