// editorialを読んだ
#include<iostream>
#include<vector>
using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; i++)  cin >> a[i], a[i]--;
    int evenLoop = 0;
    vector<bool> vis(n, 0);
    for(int i = 0; i < n; i++){
        if(vis[i])  continue;
        int len = 0;
        int now = i;
        while(!vis[i]){
            vis[i] = true;
            len++;
            i = a[i];
        }
        if(len%2 == 0)  evenLoop++;
    }
    cout << (evenLoop%2 == 0 ? "Yes" : "No") << endl;
    return 0;
}