#include<stdio.h>
int cmmdc(int a, int b)
{
    if(!b) return a;
    return cmmdc(b,a%b);
}
int main()
{
    FILE *f1 = fopen("fractii.in","r");
    FILE *f2 = fopen("fractii.out","w");
    int n,k=0,i,j;
    fscanf(f1,"%d",&n);
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(i,j)==1) k++;
    fprintf(f2,"%d",k);
    return 0;
}