import math
def main():
    n = int(input())
    p = list(map(int,input().split()))

    bit = [0 for i in range(n+1)]
    def sum(x):
        res = 0
        while x > 0:
            res = res + bit[x]
            x = x - (x&-x)
        return res
        
    def add(x, y):
        if(x == 0):
            return
        while x <= n:
            bit[x] = bit[x] + y
            x = x + (x&-x)
            
            
    ans = 1
    x = 1
    for i in range(1, n+1):
        ans = ans + sum(p[n-i]) * x
        add(p[n-i], 1)
        #x = x * i
                
    #print(ans)
    print(math.factorial(n))
    
main()