import sys

lines = sys.stdin.read().split('\n')

for i in range(len(lines) // 2):
	count = int(lines[i*2])
	monsters = [int(x) for x in lines[i*2+1].split(' ')]
	steps = 0

	for i in range(count):
		n = i + 1
		while monsters[i] != n:
			m1 = monsters[i]
			m2 = monsters[m1-1]
			monsters[m1-1] = m1
			monsters[i] = m2
			steps += 1
			
	print(steps)
	#print(sum([1 if monster != (i+1) else 0 for i, monster in enumerate(monsters)]) / 2)