A,B,C,D=map(int,input().split()) if D>=10: print("Impossible") SCORE=0 combo=0 for i in range(1000): if B>=100: SCORE+=(50*100)*(2**combo) B-=100 combo+=1 elif B<100: if (100-B)<=A: SCORE+=(50*B)*(2**combo) SCORE+=(100*(100-B))*(2**combo) A-=(100-B) B=0 combo+=1 #print(SCORE) else: SCORE+=(50*B)*(2**combo) SCORE+=(100*A)*(2**combo) #print(SCORE) break print("Possible") print(SCORE)