import java.util.*

fun main(args: Array<String>) {
    val sc = Scanner(System.`in`)

    var score = 0
    var bonus = 1

    var pf = sc.nextInt()
    var gt = sc.nextInt()
    val gd = sc.nextInt()
    val ms = sc.nextInt()

    if (ms >= 10) {
        println("Impossible")
        return
    }
    for (i in 1..Int.MAX_VALUE) {
        if (gt == 0 && pf == 0) {
            break
        } else if (gt != 0) {
            score += 50 * bonus
            gt--
        } else if (pf != 0) {
            score += 100 * bonus
            pf--
        }
        if (i % 100 == 0) {
            bonus *= 2
        }
    }
    println("Possible\n" + score.toString())
}