Cod sursa(job #360876)

Utilizator claudiu725Bruda Claudiu-Marcel claudiu725 Data 2 noiembrie 2009 17:28:16
Problema Fractii Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.27 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;

int main()
{
	ifstream fin("fractii.in");
	ofstream fout("fractii.out");
	int n,i,j,s=0;
	fin>>n;
	for (i=2;i<n;i++)
	{
		j = n/i-1;
		s += j*(j+1)/2;
	}
	fout<<(n-1)*n+1-2*s;
	fin.close();
	fout.close();
	return 0;
}