#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
using namespace std;


int main()
{
    int a, b, c, d, cnt=0, ab;
    cin >> a >> b >> c >> d;
    ab = a + b;
    if (d == 10){
        cout << "Impossible" << endl;
        return 0;
    }
    for (int i = 0; i <= 8; i++){
        if ((b >= i * 100) && (b <= (i + 1) * 100)){
            cnt += (b - i*100) * 50 * pow(2, i);
            if (ab <= (i+1) * 100){
                cnt += (ab - b) * 100 * pow(2, i);
                break;
            } else cnt += (100 - (b - 100*i))* 100 * pow(2, i);
        } else if (b > (i + 1) * 100) cnt += 50 * pow(2, i) * 100;
        else if (ab > (i + 1) * 100) cnt += 100 * pow(2, i) * 100;
        else{
            cnt += (ab - i*100) * 100 * pow(2, i);
            break;
        } 
    }
    cout << "Possible" << endl << cnt << endl;
}