#include <stdio.h>

int cmmdc(int x, int y)
{
    while(y!=1 && x!=1 && x!=y)
    {
        if (x>y) x=x-y;
        else y=y-x;
    }
    if (x==1 || y==1) return 1;
    else return x;
}
int main()
{
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    int n,s=0;
    scanf("%d",&n);
    for (int i=1; i<=n; i++)
        for (int j=1; j<=n; j++)
            if(cmmdc(i,j)==1)
                s++;
    printf("%d",s);
    fflush(stdout);
}