import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = ni()
a = na()
b = [a[i+1] > a[i] for i in range(n-1)]
c = 0
ans = 0
for i in range(n-2,-1,-1):
    if b[i] == 0:
        c += 1
    else:
        ans += c
print(ans)