#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,i,m=0;
    cin>>n;
    for(i=1;i<=n;i++){
    	if(i%2!=0&&i%5!=0) m=m+1;
    }
	cout<<m;	 
}
/**************************************************************
	Problem: 1395
	User: wangyiyang
	Language: C++
	Result: Wrong Answer
****************************************************************/