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#include <stdio.h>
#include <stdlib.h>
int main()
{
freopen("fractii.in","r",stdin);
freopen("fractii.out","w",stdout);
float s=0,c[1001],i,j;
int n,k,p=0,t,ok=0;
scanf("%d",&n);
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
{
c[p]=i/j;
p++;
}
for(k=0;k<p;k++)
{
for(t=0;t<p;t++)
{
if(t!=k)
{
if(c[k]==c[t])
{
c[t]=0;
}
}
}
}
ok=0;
for(k=0;k<p;k++)
if(c[k]!=0)
ok++;
printf("%d",ok);
return 0;
}