import sys


def input(): return sys.stdin.readline().rstrip()


def main():
    N = int(input())
    *A, = map(lambda x: int(x)-1, input().split())

    D = {}

    for i in range(N):
        c = 1
        j = A[i]
        while j != i:
            c += 1
            j = A[j]
        D[c] = D.get(c, 0) + 1

    for k, v in D.items():
        if k % 2 == 0 and (v // k) % 2 == 1:
            print('No')
            return
    print('Yes')


if __name__ == '__main__':
    main()