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

    bit = array.array('i')
    bit.fromlist(list([0 for i in range(n+2)]))
    
    ans = 1
    a = 1
    c = 1
    for i in reversed(p):
        x = i
        y = i
        v = 0
        
        while x > 0:       
            v = v + bit[x]
            x = x - (x&-x)
            
        while y <= n:     
            bit[y] = bit[y] + 1
            y = y + (y&-y)
            
        t = a * v
        ans= t + ans
        a = a * c
        c = c + 1

    print(ans)
    
main()