package yukicoder;

import java.util.*;

import javax.swing.plaf.synth.SynthScrollBarUI;

public class Q100 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] a = new int[N];
		for (int i = 0; i < N; ++i) {
			a[i] = sc.nextInt() - 1;
		}

		int[] count = new int[N];
		boolean[] vis = new boolean[N];
		int[] loop_size = new int[N + 1];
		for (int i = 0; i < N; ++i) {
			vis[i] = true;
			count[a[i]] = count[i] + 1;
			if (vis[a[i]]) {
				++loop_size[count[a[i]]];
			}
		}

		int even = 0;
		for (int i = 0; i <= N; ++i) {
			if (i % 2 == 0 && loop_size[i] > 0)
				++even;
		}
		if (even % 2 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}

	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}