#int(input())
#map(int, input().split())
#list(map(int, input().split()))


N = int(input())
S = list(map(int, input().split()))

t = 0
for i in range(N):
    u = S[i]
    if u != i+1:
        t += 1
        S[i], S[u-1] = S[u-1], S[i]

print(-(t % 2) * 2 + 1)