#include <iostream>
#include <cmath>
using namespace std;

int main()
{
	int i;
	int n;

	float sum = 0;

	cout << "Please enter the number of n: ";
	cin >> n;

	for (i = 1; i <= n; i++)
	{
		sum += sqrt((float)i) - sqrt((float)i-1);
	}

	cout << endl << "The sum of (sqrt(1)-sqrt(0))+(sqrt(2)-sqrt(1))+...+(sqrt(n)-sqrt(n-1)) is "
	     << endl << sum <<endl;
	return 0;
}