#include<iostream.h>
#include<fstream.h>
int a[20],i,t,n;
int main()
{ifstream f("ciur.in");
ofstream g("ciur.out");
f>>n;
	for(i=1;i<=n-1;i++)
	a[i]=i+1;
	
	
for(i=1;i<=n;i++){
if((a[i]!=2)&&(a[i]%2==0))a[i]=0;
if((a[i]!=3)&&(a[i]!=0)&&(a[i]%3==0))a[i]=0;
if((a[i]!=5)&&(a[i]!=0)&&(a[i]%5==0))a[i]=0;
if((a[i]!=7)&&(a[i]!=0)&&(a[i]%7==0))a[i]=0;
}
	for(i=1;i<=n;i++)
		if(a[i]!=0)t++;
	g<<t;
			
}