#include <iostream>
#include <cmath>
#include <cstdio>

using namespace std;

int main( int argc , char * argv[] ) {

    int a,d;
    long int count = 0;
    float b,c;

    cin >> a;
    b=a;

    c=sqrt(b);
    d=c;

    for( int i=1 ; i <= d ; i++ ) {
        printf("%d/%d - %d-%i\n" , a,i,d,i);
        count = count + ( (a/i) - (d-i) );
    }

    cout << count << endl;
    return 0;
}