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