#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int n;
  cin>>n;
  vector<Int> a(n);
  for(Int i=0;i<n;i++) cin>>a[i];
  for(Int i=0;i<n;i++) a[i]--;

  vector<Int> used(n,0),sz(n+1,0);
  for(Int i=0;i<n;i++){
    if(used[i]) continue;
    Int k=i,x=0;
    while(!used[k]) used[k]=1,k=a[k],x++;
    sz[x]++;    
  }
  
  Int flg=1;
  for(Int i=0;i<=n;i+=2) flg&=~sz[i]&1;
  cout<<(flg?"Yes":"No")<<endl;
  return 0;
}