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

#define INF_LL (int64)1e18
#define INF (int32)1e9
#define REP(i, n) for(int64 i = 0;i < (n);i++)
#define FOR(i, a, b) for(int64 i = (a);i < (b);i++)
#define all(x) x.begin(),x.end()
#define fs first
#define sc second

using int32 = int_fast32_t;
using uint32 = uint_fast32_t;
using int64 = int_fast64_t;
using uint64 = uint_fast64_t;
using PII = pair<int32, int32>;
using PLL = pair<int64, int64>;

const double eps = 1e-10;

template<typename A, typename B>inline void chmin(A &a, B b){if(a > b) a = b;}
template<typename A, typename B>inline void chmax(A &a, B b){if(a < b) a = b;}

int64 gcd(int64 a, int64 b){
	if(b == 0) return a;
	return gcd(b, a%b);
}

int main(void){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int32 A, B, C, D;
	cin >> A >> B >> C >> D;
	if(D >= 10){
		cout << "Impossible" << endl;
		return 0;
	}
	int32 cnt = 0;
	int64 mul = 1;
	int64 res = 0;
	REP(i, B){
		res += mul*50;
		cnt++;
		if(cnt % 100 == 0){
			mul *= 2;
		}
	}
	REP(i, A){
		res += mul*100;
		cnt++;
		if(cnt % 100 == 0){
			mul *= 2;
		}
	}
	cout << "Possible" << endl << res << endl;
}