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

int fractii(int n)
{
    int i,j,N=0;

    for(i=2;i<=n;i++)
    {
        for(j=2;j<i;j++)
        {
            if(i%j) N++;
        }
    }
    return (N+n)*2-1;
}

int main()
{
    int x;

    FILE * fp=fopen("fractii.in","r");
    FILE * g=fopen("fractii.out","w");

    while(fscanf(fp,"%d\n",&x)!=EOF)
    {
        fprintf(g,"%d\n",fractii(x));
    }

    return 0;
}