#include<bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

void vprint(vector<ll> A){
    ll L = A.size();
    FOR(i, 0, L){
        if(i) cout << ' ';
        cout << A[i];
    }
    cout << endl;
}

ll ll_pow(ll a, ll n){
    ll ans = 1;
    FOR(i, 0, n){
        ans *= a;
    }
    return ans;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll A, B, C, D;
    cin >> A >> B >> C >> D;

    if(D>=10){
        p("Impossible");
        return 0;
    }else{
        p("Possible");
    }

    // great, perfectの順にスコア加算
    ll combo = 0;
    ll score = 0;
    FOR(i, 0, B){
        combo++;
        ll scale = ll_pow(2, (combo-1)/100);
        score += 50 * scale;
    }

    FOR(i, 0, A){
        combo++;
        ll scale = ll_pow(2, (combo-1)/100);
        score += 100 * scale;
    }

    p(score);
    
    return 0;
}