#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 100000000000


int main(){
	
	int N;
	cin>>N;
	
	vector<int> a(N);
	rep(i,N){
		cin>>a[i];
		a[i]--;
	}
	
	dsu D(N);
	rep(i,N)D.merge(i,a[i]);
	
	set<int> s;
	auto g = D.groups();
	
	rep(i,g.size()){
		if(g[i].size()%2==1)continue;
		int t = g[i].size();
		if(s.count(t))s.erase(t);
		else s.insert(t);
	}
	
	if(s.size()==0)cout<<"Yes"<<endl;
	else cout<<"No"<<endl;
	
	return 0;
}