func_code_string: #include<bits/stdc++.h>   #define pb push_back   #define mk make_pair   #define ll long long   #define ss second   #define ff first   #define pll pair<ll,ll>   #define vll vector<ll>   #define mll map<ll,ll>   #define mod 1000000007   #define w(x) ll x; cin>>x; while(x--)   #define ps(x,y) fixed<<setprecision(y)<<x;   #define fo(i, j, k, in) for (ll i=j ; i<k ; i+=in)   #define re(i, j) fo(i, 0, j, 1)   #define pi 3.1415926535897932384626433832795   #define all(cont) cont.begin(), cont.end()   #define countbit(x) __builtin_popcount(x)   #define mod 1000000007   #define lo lower_bound   #define de(n) ll n;cin>>n;   #define def(a,n) ll n;cin>>n;ll a[n];re(i,n){cin>>a[i];}   #define defi(a,n,k) ll n;cin>>n; ll k;cin>>k;ll a[n];re(i,n){cin>>a[i];}   #define deb(x) cout<<#x<< = <<x<<endl;   #define tr(it,a) for(auto it=a.begin();it!=a.end();it++)   #define nl cout<<endl;      using namespace std;            int main()   {   ios_base::sync_with_stdio(0);   cin.tie(0);                  int n;           cin>>n;           int x[2]={1,-1};              int y[2]={1,-1};           pair<int,int> p;           p.first=0;           p.second=0;           int a1=n/2;           int a2=n-n/2;           if(n%2!=0){               int c=a2+1;               int d=(a1+1);               ll ans=1ll*2*(c*d);               cout<<ans<<endl;           }           else{               int c=a2+1;               int d=a1+1;               ll ans=1ll*c*d;               cout<<ans<<endl;           }                                                                       return 0;   }   