#include <iostream>
#include <vector>
#include <queue>
#include <string>

using namespace std;

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