#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
using namespace std;

//#include<bits/stdc++.h>

int main() {
	
	int a, b, c, d;
	cin >> a >> b >> c >> d;

	if (d == 10) {
		cout << "Impossible";
		return 0;
	}
	long long int p = 0;
	
	int x = 0;
	//x += c;
	while (b) {
		p += 50 * pow(2,(x / 100));
		x++;
		b--;
	}

	while (a) {
		p += 100 * pow(2, (x / 100));
		x++;
		a--;
	}
	cout << "Possible" << endl << p << endl;


	return 0;
}