#include<stdio.h>
int f,m,i,j,n,k;
int main()
{
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    
    scanf("%d",&n);
    
    for(i=2;i<=n;i++)
        for(j=2;j<=n;j++)
        {
            k==0;
            
            if(i>j)
                for(k=2;k<=j;k++)
                    if(i%k==0&&j%k==0) f=1;
            else
                for(k=2;k<=j;k++)
                    if(i%k==0&&j%k==0) f=1;
                    
            if(!f) m++;
        }
        
    printf("%d",m+n);
    
    return 0;
    
}