Stuff

#include<iostream>#include<vector>#include<algorithm>#include<string>#include<math.h>using namespace std;long long prob5(int n);int main(){   int vount=prob5(4);   cout<<endl<<vount;   getchar();   return 0;}long long prob5(int n){        long long vount=(pow(3,n)+1)/2;    return vount;    }