#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
using namespace std;
typedef long long int ll;
using ull = unsigned long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int a,b,c,d; cin >> a >> b >> c >> d;
    if(d>=10){
        printf("Impossible\n");
    }
    else{
        printf("Possible\n");
        int res=0;
        int p=1;
        for(int i=1;i<=a+b;i++){
            if(i<=b){
                res+=p*50;
            }
            else{
                res+=p*100;
            }
            if(i%100==0)p*=2;
        }
        printf("%d\n",res);
    }
}