func_code_string: #include <bits/stdc++.h>   using namespace std;          bool checktwo(long long int n){if(n==0){return false;}else{return (ceil(log2(n)) == floor(log2(n)));}}   long long int powerof2lte(long long int n){int p = (long long int)log2(n);return (long long int)pow(2, p);}    long long int numdigits(long long int n){return floor(log10(n)) + 1; }      int main()   {       long long int n;       cin>>n;       cout<<2 - (n*n)<<  n ;   }