from collections import *

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

pp = []
for i in range(1, n + 1):
    pp.append(i)
d = defaultdict(int)
for i in range(n):
    d[p[i]] = i  # 要素p[i]はどのインデックスにあるか

cnt = 0

for i in range(1, n + 1):
    if p == pp:
        print(cnt)
        exit()
    if d[i] == i - 1:
        continue
    for j in range(p[i - 1], i , -1):
        d[j], d[j - 1] = d[j - 1], d[j]
        cnt += 1
    tmp = [None] * n
    for j in range(1, n + 1):
        tmp[d[j]] = j
    p = tmp

print(cnt)