
maximum = 0
max_summ = 28
n = int(input())
summs = [0] * max_summ
for i in range(n):
summ = 0
number = int(input())
while number > 0:
summ += number % 10
number //= 10
summs[summ] += 1
for i in range(max_summ):
if summs[i] > maximum:
maximum = summs[i]
minimum = i
print(minimum)