#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

int main() {
    int n; cin >> n;
    vector<int> a(n);
    for (int &ai: a) cin >> ai, ai--;
    vector<int> loop(n + 1, 0);
    for (int i = 0; i < n; i++) {
        int cnt = 0;
        for (int t = i; cnt == 0 || t != i; t = a[t]) cnt++;
        loop[cnt]++;
    }
    bool ng = 0;
    for (int i = 2; i <= n; i += 2) ng |= loop[i] / i % 2;
    cout << (!ng ? "Yes" : "No") << endl;
    return 0;
}