#include<iostream.h>
#include<fstream.h>
long long a[2000001],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]!=0)&&(a[i]%2==0)){a[i]=0;t++;}
if((a[i]!=3)&&(a[i]!=0)&&(a[i]%3==0)){a[i]=0;t++;}
if((a[i]!=5)&&(a[i]!=0)&&(a[i]%5==0)){a[i]=0;t++;}
if((a[i]!=7)&&(a[i]!=0)&&(a[i]%7==0)){a[i]=0;t++;}
}
	
g<<t;
			
}