#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
int main(){
	int a,b,c,d;
	cin>>a>>b>>c>>d;
	if(d==10)
		cout<<"Impossible"<<endl,exit(0);
	cout<<"Possible"<<endl;
	int ans=0,arr[800];
	fill(arr,arr+b,50);
	fill(arr+b,arr+a+b,100);
	for(int i=0;i<a+b;i++)
		ans+=arr[i]<<i/100;
	cout<<ans<<endl;
}