#include <stdio.h>
#include <math.h>

int main(){
	int perfect,great,good,miss,i;
	scanf("%d %d %d %d",&perfect,&great,&good,&miss);
	if(10<=miss) printf("Impossible\n");
	else{
		printf("Possible\n");
		int score=0;
		int combo=0;
		for(i=0;i<great;i++){
			score+=50*pow(2,floor(combo/100));
			combo++;
		}
		for(i=0;i<perfect;i++){
			score+=100*pow(2,floor(combo/100));
			combo++;
		}
		printf("%d",score);
	}
	return 0;
}