#define _USE_MATH_DEFINES
#include<iostream>
#include<algorithm>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<deque>
#include<map>
#include<set>
#define ll long long
#define dou(s) atof(s.c_str())
#define lon(s) atoll(s.c_str())
#define str(n) to_string(n)
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define rrep(i,b,a) for(ll i=b;i>=a;i--)
#define ALL(a) a.begin(),a.end()
#define rALL(a) a.rbegin(),a.rend()
#define fion(n) fixed<<setprecision(n)
#define endl "\n"
#define OR ||
#define AND &&
#define NOT !
#define line(s) getline(cin,s)
#define MOD 1000000007ll
#define START int main(){cin.tie(0);ios::sync_with_stdio(false);
#define END }
using namespace std;
START
ll a,b,c,d;cin>>a>>b>>c>>d;
if(d==10)cout<<"Impossible"<<endl;
else{
	ll ans=0;
	cout<<"possible"<<endl;
	rep(i,1,a+b+1){
		if(i<=b){
			ans+=pow(2,(i-1)/100)*50;
		}else{
			ans+=pow(2,(i-1)/100)*100;
		}
	}
	cout<<ans<<endl;
}
END