i = int(input())

list_1 = list(map(int,input().split()))

list_1.sort()

x = 0

while x < len(list_1) - 1:

if list_1[x] != list_1[x + 1]:

    print(list_1[x])
    break
else:

    x += i  # Skip over group

else:

# If captain is at the end
print(list_1[-1])