N = int(input())
a = list(map(int,input().split()))
flg = [1] * N
cnt = [0] * (N+1)
for i in range(N):
    if flg[i]:
        idx = i
        Roop = 0
        while flg[idx]:
            flg[idx] = 0
            idx = a[idx] - 1
            Roop += 1
        cnt[Roop] += 1
for i in range(0,N+1,2):
    if cnt[i] % 2:
        print('No')
        exit()
print('Yes')