import sys
input=sys.stdin.readline

def main(args):
    N = int(input())
    A = list(map(int,input().split()))
    
    ans = 0
    flag = 0
    for i,a in enumerate(A):
        #print("a",a)
        if not flag:
            ans += 1
            flag = 1
        else:
            flag = 0
            if a == A[i-1]:
                ans += 1
                flag = 1
        #print("ans",ans)
    
    print(ans)

if __name__ == '__main__':
    main(sys.argv[1:])