#include <fstream.h>

unsigned long int n, cont, i, j;


int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    
    
    fin >> n;
    
    for (i = 1; i <= n; i++)
        for (j = 1; j <= n; j++)
		if (i %j != 0) cont++;
		else if (j == 1) cont++;
        
    fout << cont;
    
    fin.close();
    fout.close();
    return 0;
}