#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