#!/usr/bin/env python3
import functools
import operator

N = int(input())
a = [0] + list(map(int, input().split()))
rest = list(range(len(a)))
loop = []
while True:
    if len(rest) == 0:
        break
    now = rest[0]
    count = 0
    while True:
        rest.remove(now)
        now = a[now]
        if now not in rest:
            loop.append(count)
            break
        count += 1
if len(list(filter(lambda x: x % 2 != 0, loop))) == 0:
    print("Yes")
else:
    print("No")