package main

import "fmt"

func main() {
	var (
		score          = 0
		bonus          = 1
		pf, gt, gd, ms int
	)
	fmt.Scan(&pf, &gt, &gd, &ms)

	if ms >= 10 {
		fmt.Println("Impossible")
		return
	}

	for i := 1; ; i++ {
		switch {
		case gt == 0 && pf == 0:
			fmt.Printf("Possible\n%d", score)
			return
		case gt != 0:
			score += 50 * bonus
			gt--
		case pf != 0:
			score += 100 * bonus
			pf--
		}
		if i%100 == 0 {
			bonus *= 2
		}
	}
}