#include <cstdio>
int main()
{
	int n,nrfractii=0;
	FILE*fin;
	FILE*fout;
	fin=fopen("fractii.in","r");
	fout=fopen("fractii.out","w");
	fscanf(fin,"%d",&n);
	for(int i=1;i<=n;i++)
		for(int j=1;j<=n;j++)
		{
			if(i==1)
			{
				nrfractii+=n;
				break;
			}
			if(j==1)
			{
				nrfractii++;
				continue;
			}
			else
			{
				if(i>j)
				{
					if(i%j)
						nrfractii++;
				}
				else
				{
					if(j%i)
						nrfractii++;
				}
			}
		}
	fprintf(fout,"%d",nrfractii);
	fclose(fin);
	fclose(fout);
}