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

    bit = [0] * (n+1)
    
    ans = 1
    a = 1
    for i in range(1, n+1):
        x = p[n-i]
        
        v = 0
        while x > 0:
            v = v + bit[x]
            x = x - (x&-x)
            
        t = a * v
        ans= t + ans
        
        x = p[n-i]
        while x <= n:
            bit[x] = bit[x] + 1
            x = x + (x&-x)
            
        a = a * i

    print(ans)
    
main()