func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   const int N = 2e5;   int dep[N], fa[N], cnt[N], ans;   int main() {     ios ::sync_with_stdio(0);     cin >> n;     ans = 1;     for (int i = 2; i <= n; ++i) {       cin >> fa[i];       dep[i] = dep[fa[i]] + 1;       cnt[dep[i]] ^= 1;     }     for (int i = 1; i <= n; ++i) ans += cnt[i];     cout << ans << endl;   }   