#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq


def input():
    return sys.stdin.readline()[:-1]


# sys.setrecursionlimit(1000000)

# _INPUT = """3
# 3 2 1

# """
# sys.stdin = io.StringIO(_INPUT)

INF = 10**10

N = int(input())
A = list(map(lambda x: int(x)-1, input().split()))

Pos = [-1] * N
for i in range(N):
    Pos[A[i]] = i

n = 0
for i in range(N):
    while A[i] > i:
        for k in reversed(range(i, A[i])):
            A[Pos[k]] = k+1
            Pos[k+1] = Pos[k]
            n += 1
        A[i] = i
        Pos[i] = i

print(n)