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

dp = [float('inf')] * (N)
dp[0] = 0

s = 0
g = R[s]
while(1):
    dp[g-1] = min(dp[g-1], dp[s] + 1)
    if g == N:
        break
    s = g
    g = R[s]
dp[N-1]