Sofdor

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))