A.py

#===========Template===============
from io import BytesIO, IOBase
import sys,os
inpl=lambda:list(map(int,input().split()))
inpm=lambda:map(int,input().split())
inpi=lambda:int(input())
inp=lambda:input()
rev,ra,l=reversed,range,len
P=print
BUFSIZE = 8192
class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
def input(): return sys.stdin.readline().rstrip("\r\n")

#=========I/p O/p ========================================#
from bisect import bisect_left as bl 
from bisect import bisect_right as br
import sys,operator,math,operator
from collections import Counter 

import random
#==============To chaliye shuru krte he ====================#
n=inpi()
li=inpl()
li.sort()
c,ans=0,0
for i in ra(n):
   if li[c]<li[i]:
       c+=1
       ans+=1
P(ans) 
# for i in ra(n):
#     idx=br(li1,li[i])
#     if idx==n:
#         omap[li1[j]]-=1
#         arr.append(li1[j])
#         if omap[li1[j]]==0:
#             del omap[li1[j]]
#         j+=1
#     else:
#         if li1[idx] in omap:
#             omap[li1[idx]]-=1
#             arr.append(li1[idx])
#             if omap[li1[idx]]==0:
#                 del omap[li1[idx]]
#             ans+=1
#         else:
#             while idx!=n:
#                 idx=br(li1,li1[idx])
#                 if idx!=n:
#                     if li1[idx] in omap:
#                         break
#                 else:
#                     break
#             if idx!=n:
#                 omap[li1[idx]]-=1
#                 arr.append(li1[idx])
#                 if omap[li1[idx]]==0:
#                     del omap[li1[idx]]
#                 ans+=1
#             else:
#                 omap[li1[j]]-=1
#                 arr.append(li1[j])
#                 if omap[li1[j]]==0:
#                     del omap[li1[j]]
#                 j+=1
# P(ans)