#!/bin/python

def solve():
    num = int(input())
    array = list(map(int, input().split()))

    res = 0

    for i in range(num):
        n = array[i]
        while i != n-1:
            array[i], array[n-1] = array[n-1], array[i]
            res += 1
            n = array[i]
    print(res)


def main():
    try:
        while True:
            solve()
    except:
        pass

main()