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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    vector<int> A(N);
    for(auto &a : A) cin >> a,a--;

    vector<bool> already(N);
    vector<int> len(N+1);
    for(int i=0; i<N; i++){
        if(already.at(i)) continue;
        already.at(i) = true;
        int loop = 1,pos = A.at(i);
        while(pos != i) already.at(pos) = true,loop++,pos = A.at(pos);
        if(loop%2 == 0) len.at(loop)++;
    }
    for(auto l : len) if(l%2){cout << "No\n"; return 0;}
    cout << "Yes\n";
}