package main

import . "fmt"

func main() {
	var a,b,c,d int64
	Scan(&a,&b,&c,&d)
	if d==10 {
		Println("Impossible")
		return
	}
	Println("Possible")
	var s int64
	for i:=0;i<int(a+b);i++ {
		if i<int(b) {
			s+=50*(1<<(i/100))
		} else {
			s+=100*(1<<(i/100))
		}
	}
	Println(s)
}