#!/usr/bin/python

try:
    while True:
        N = int(input())
        seq_ = list(map(int, input().split(' ')))
        seq = [0] + seq_

        x = 0
        mapa = { }
        for i in range(len(seq)):
            mapa[seq[i]] = i
        # mapa = {k: i for i, /k in enumerate(seq)}
        for i in range(N+1):
            if seq[i] != i:
                x += 1
                pos = mapa[i]
                seq[pos] = seq[i]
                mapa[seq[i]] = pos
        print(x)
except EOFError:
    pass