total = 0;
ter = []

n = int(input())
ter = list(map(int, input().split()))
ids = [[] for i in range(max(ter) + 1)]

for i in range(n):
	ids[ter[i]].append(i)
total = 0
for i in  range(len(ids)):
	if len(ids[i]) >= 2:
		for k in range(len(ids[i]) - 1):
			j = i
			while j < len(ids):
				br = True
				for el in range(len(ids[i])):
					try:
						if ids[i][k] < ids[j][el] < ids[i][k + 1]:
							br = False
							j = len(ids) + 1
					except IndexError:
						pass
				j+=1
			if br:
				total += ids[i][k + 1] - ids[i][k] - 1 

print(total)