import sys
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


N = I()
A = [0]+LI()

flag = [0]*(N+1)
a = 0
for i in range(1,N+1):
    if flag[i]:
        continue
    cur = A[i]
    flag[i] = 1
    count = 1
    while cur != i:
        flag[cur] = 1
        cur = A[cur]
        count += 1
    if count % 2 == 0:
        a += 1

if a % 2 == 0:
    print('Yes')
else:
    print('No')