#include <iostream>
#include <bitset>
#include <fstream>
#include <string>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <vector>
#include <algorithm>
#include <numeric>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <deque>
#include <functional>
#include <cctype>
#include <list>
#include <limits>
//#include <boost/multiprecision/cpp_int.hpp>

const double EPS = (1e-10);


using namespace std;
using Int = long long;
//using namespace boost::multiprecision;

const Int MOD = 1000000007;

Int mod_pow(Int x, Int n) {
    Int res = 1;
    while(n > 0) {
        if(n & 1) res = (res * x) % MOD; //ビット演算(最下位ビットが1のとき)
        x = (x * x) % MOD;
        n >>= 1; //右シフト(n = n >> 1)
    }
    return res;
}


int main(){
    cin.tie(0);

    int a[4];
    for (int i = 0; i < 4; i++){
        cin >> a[i];
    }
    int ans = 0;
    if (a[3] >= 10) cout << "Impossible" << endl;
    else{
        cout << "Possible" << endl;
        int tmp = a[0] + a[1];
        for (int i = 1; i <= tmp; i++){
            if (a[1] > 0){
                ans += 50 * mod_pow(2, (i-1)/100);
                a[1]--;
            }else{
                ans += 100 * mod_pow(2, (i-1)/100);
                a[0]--;
            }
        }
        cout << ans << endl;
    }

}