Cod sursa(job #356331)

Utilizator matzipanAndrei matzipan Data 14 octombrie 2009 13:54:15
Problema Fractii Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.32 kb
Raporteaza aceasta sursa 
#include <fstream>
using  namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
unsigned long N,i,x,nr;
unsigned long era() {
	long nr;
	nr=N-2;
	for(x=2; x*i<N; x++) 
		nr--;
	if(2*i>N) nr=0; 
	return nr;
}
int main() {
	in>>N;
	nr=N;
	for(i=2;i<=N;i++)
		nr+=era();
	out<<nr;
	return 0;
}