#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int INF = 1e9;
int MOD = 1e9+7;
main(){
    int N,M;
    cin >> N >> M;
    if((N == 1 || N == 2) && M == 0)cout << "Impossible" << endl;
    else cout << "Possible" << endl;
}