#182 new
# your code goes here
N=int(input())
A=[int(i) for i in input (). split ()]
#=[1]*N
i=0
C=0
while i<len(A):
    j=i+1
    nd=0
    while j<len(A) and nd==0:
        if A[i]==A[j]:
 #           print (i)
            A.pop(j)
   #         B[i]=0
     #       B[j]=0
            nd=1
        j+=1
    if nd==0:
        C+=1
    i+=1
#S=0
#or i in range (N):
   # S+=B[i]
print (C)