for i in range(int(input())):
	n=int(input())
	li=list(map(int,input().split()))
	max=0
	area=0
	for j in range(0,n):
		area=(n-j)*li[j]
		if area>max:
			max=area
	print("Case "+str(i+1)+": "+str(max))
{"mode":"full","isActive":false}