N = int(input())
A = list(map(int, input().split()))
i = 0
n = 0

while i < N-1:
	if A[i] != A[i+1]:
		n += 1
		if i > 0 and A[i] == A[i-1]:
			n -= 1
	i += 1
if A[N] != A[N-1]:
	n+= 1

print(n)