#include <stdio.h>

using namespace std;

int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    FILE* f=fopen("fractii.in","r");
    int n,nr=1,i,j;
    fscanf(f,"%d",&n);
    for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
    {
        if(i!=j)
        {
            if(cmmdc(i,j)==1)nr++;

        }
    }
     FILE* fout=fopen("fractii.out","w");
fprintf(fout,"%d",nr);
    return 0;
}