#include<bits/stdc++.h>
using namespace std;
int n,m;
int main(){
    cin>>n>>m;
    bool ans;
    if(n==1){
        if(m==0)ans=0;
        else ans=1;
    }else if(n==2){
        if(m==0)ans=0;
        else ans=1;
    }else{
        ans=1;
    }
    if(ans)cout<<"Possible"<<endl;
    else cout<<"Impossible"<<endl;
    return 0;
}