n=int(input())
ls=list(map(int,input().split()))
ls.sort()
cnt=0
if n==1:
    cnt+=1
for i in range(n-2):
    if i==0:
        if ls[i]!=ls[i+1]:
            cnt+=1
    if i==n-3:
        if ls[i+1]!=ls[i+2]:
            cnt+=1
    if ls[i]!=ls[i+1]!=ls[i+2]:
        cnt+=1
print(cnt)