T = 1
while True:
a = int(input())
if a == 0:
break
L = []
for i in range(a):
L.append(list(map(int,input().split())))
S = 0
for i in range(a):
if i == 0:
S+=L[i][0]
elif i == a-1:
S+=sum(L[i])
else:
S+=L[i][0] + L[i][-1]
print("Case #{}:{}".format(T,S))
T+=1