import sys
#input = sys.stdin.readline
#input = sys.stdin.buffer.readline #文字列はダメ
#sys.setrecursionlimit(1000000)
#import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
from collections import defaultdict 
#from collections import deque
#import copy
import math
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
#MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]
#dx = [1,1,-1,-1]
#dy = [1,-1,1,-1]

def main():
    N = int(input())
    X = list(map(int,input().split()))
    c = 1
    p = 1
    for i in range(N):
        dic = defaultdict(int)
        mn = N
        for x in X:
            dic[x] += 1
            mn = min(mn, x)
        c *= dic[mn]
        p *= N-i
        g = math.gcd(c,p)
        c //= g
        p //= g
        X.remove(mn)
        #print(c,p)
    print(p)

if __name__ == '__main__':
    main()