#include <iostream>   
#include <string>

using namespace std;

void computeSum(int, float&);

int main()
{

  int num;
  float sum = 0.0;

  cout << "Enter an integer: ";
  cin >> num;

  computeSum(num, sum);

  cout << "The sum of the reciprocals from 1 to " 
       << num << " is " 
       << sum << endl;

  return 0;
}

void computeSum(int n, float& s){
  for(int i = 1; i<=n; i++){
    s = s + (1.0/float(i));
  }
}