N = int(input())
a = list(map(int,input().split()))
G = [0] * N
for i in range(N):
    G[i] = a[i] - 1
flg = [1] * N
cnt = 0
for i in range(N):
    if flg[i]:
        idx = i
        cnt2 = 0
        while flg[idx]:
            flg[idx] = 0
            idx = G[idx]
            cnt2 += 1
        if not cnt2 % 2:
            cnt += 1
if not cnt % 2:
    print('Yes')
else:
    print('No')