#include<iostream>
using namespace std;
// ASCII art letter H
int main()
{
	int n;
	cout<<"Enter size: ";
	cin>>n;
	
	//Check is homework. Assume size >=5 and is odd
	for(int i=0 ; i<n; i++) //number of rows
	//each iteration is a row
	{
		/*When j is 0 or n-1, it is at the beginning and end of the line. So, we print a character. 
		Special case: When we're on the middle row, we print * for every column.*/
		for(int j=0; j<n; j++) //each iteration is a column
		{
			if(j==0 || j == (n-1))
				cout<<"*";
			else if(i == n/2)
				cout<<"*";
			else cout<<" ";
		}
		//done with this line, go to next
		cout<<endl;
		
	}
	
	//print all factors of a number
	
	cout<<"Enter a number: ";
	cin>> n;
	//go from 1 to the number. If a number didivdes n cleanly, it is a factor	
	for(int i=1; i<=n; i++)
		if(n%i == 0)
			cout<<i<<"\t";
	cout<<endl;
	
	//calculate sums of the powers of 2
	cout<<"Enter the highest power: ";
	cin>>n;
	
	int sum=0, cur =1;
	//each power of 2 is the previous power of 2 multiplied by 2
	for(int pow=0; pow<=n; pow++)
	{
		sum = sum + cur;
		cur = cur * 2;
	}
	cout<<"The sum is "<<sum<<endl;
	
	return 0;
}