#include <stdio.h>
#include <stdlib.h>

int main()
{
    FILE *fp, *fr;
    fp=fopen("fractii.in","r");
    fr=fopen("fractii.out","w");
    int n,i,j,num=0;
    fscanf(fp,"%d",&n);
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
    {
        if(j==1)
            num++;
        else
            if(j%i==0)
            num++;
    }
    fprintf(fr,"%d",num);
    return 0;

}