#include <bits/stdc++.h>
using namespace std;

int main(void) {
	int N;
	cin >> N;
	
	vector<int> A(N);
	for(int i = 0; i < N; ++i) cin >> A[i], --A[i];
	
	vector<int> cnt(N + 1, 0);
	vector<bool> seen(N, false);
	for(int i = 0; i < N; ++i) {
		if(seen[i]) continue;
		
		int now = i, siz = 0;
		do {
			now = A[now];
			seen[now] = true;
			siz += 1;
		} while(now != i);
		
		cnt[siz] += 1;
	}
	
	for(int i = 2; i <= N; i += 2) {
		if(cnt[i] % 2 == 1) {
			cout << "No\n";
			return 0;
		}
	}
	
	cout << "Yes\n";
	
	return 0;
}