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

z = [0]*N
pre=10**6
skip = False
renzoku=False
for i in range(N):
    if not renzoku:
        if A[i]==pre:
            renzoku=True
            if i>1:
                z[i-2]=0
            z[i]=1
            z[i-1]=1
            skip=True
        else:
            if skip:
                skip=False
            else:
                z[i]=1
                skip=True
    else:
        if A[i]!=pre:
            skip=False
            renzoku=False
        else:
            z[i]=1
    pre=A[i]
print(sum(z))