forsumnatural.cpp

#include<iostream>
using namespace std;

int main()
{	
	   int i,n,sum=0;
	   cin>>n;
	
	for( i = 1;i <= n;i++){
		cout<<i<<" ";
		}

	sum = i + n;
	cout<<"\nthe sum is: "<<sum;

return 0;
}