#!/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(0)
except EOFError:
    pass