#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i,n) for (int i = 0; i < (n); ++i)
using ld = long double;
using ll = long long;

template<class T> bool chmax(T &a, T b) {
 if(a<b) {
    a = b;
    return true;
  }
  return false;
}
template<class T> bool chmin(T &a, T b) {
  if(a>b) {
    a = b;
    return true;
  }
  return false;
}

int main()
{
	int a, b;
	cin >> a >> b;
	cout << (abs(a-b)%2==0?"Possible":"Impossible") << endl;
}