func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = 0x3f3f3f3f;   const int maxn = 1000000;   const int mod = 998244353;   bool cmp(int x, int y) { return x > y; }   int main() {     long long n, ans = 0;     cin >> n;     if (n == 0) {       cout << 0;       return 0;     }     n += 1;     if (n % 2 == 0) {       ans = n / 2;     } else {       ans = n;     }     cout << ans;     return 0;   }   