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

int main(){
	int a,b,c,d;
	int score=0;
	int count=0;
	int i;
	
	scanf("%d%d%d%d",&a,&b,&c,&d);
	if (d==10){
		printf("Impossible\n");
	}else{
		for(i=0;i<b;i++){
			score += 50*(int)pow(2.0,(double)(count/100));
			count += 1;
		}
		for(i=0;i<a;i++){
			score += 100*(int)pow(2.0,(double)(count/100));
			count += 1;
		}
		
		printf("Possible\n");
		printf("%d\n",score);
	}
}