// A comment line begins like this in C++ programs
// Program to calculate 2**n
// Standard ANSI-C++ include files */
#include <iostream>
#include <cmath>
using namespace std
int main()
{
   int  int1, int2, int3;
// print to screen
   cout << "Read in the exponential N for 2^N =" << endl;
// read from screen
   cin >> int2;
   int1 = (int) pow(2., (double) int2);
   cout << " 2^N * 2^N = " << int1*int1 << endl;
   int3 = int1 - 1;
   cout << " 2^N*(2^N - 1) = " << int1 * int3  << endl;
   cout << " 2^N- 1 = " << int3  << endl;
   return 0;

// End: program main()