#include #include #define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++) #define REP(i,n) FOR(i,0,n) #define MOD 1000000007 //#define int long long using namespace std; typedef long long ll; typedef vector V; typedef vector VV; const int INF = 1e9; signed main() { int N, M; cin >> N >> M; if (N > 3) { if (M > 3) { cout << "Possible" << endl; } else if (M == 0) { cout << "Possible" << endl; } else { cout << "Possible" << endl; //assert(false); } } else if (N == 3) { if (M == 2) { cout << "Possible" << endl; } else { cout << "Possible" << endl; } } else if (N == 2) { if (M == 0) { cout << "Impossible" << endl; } else { cout << "Possible" << endl; } } else if (N == 1) { if (M == 0) { cout << "Impossible" << endl; } else { cout << "Possible" << endl; } } }