import sys
readline=sys.stdin.readline
from collections import Counter

N=int(readline())
A=list(map(int,readline().split()))
for i in range(N):
    A[i]-=1
loop=[0]*(N+1)
seen=[False]*N
for i in range(N):
    if seen[i]:
        continue
    cnt=0
    while not seen[i]:
        seen[i]=True
        i=A[i]
        cnt+=1
    loop[cnt]+=1
ans="Yes"
for i in range(N+1):
    if i%2==0 and loop[i]%2:
        ans="No"
print(ans)