#include<bits/stdC++.h>
using namespace std;
int main(){
	int a,b=1,c,d=0,e=0;
	cin>>a;
	while(b<=a){
		c=b;
		d=0;
		while(c>0){
			d=c%10+d;
			c=c/10;
		}
		if(d%2!=0&&d%5!=0){
				e++;
			}b++;
	}
	cout<<e;
}
/**************************************************************
	Problem: 1395
	User: panyuchen
	Language: C++
	Result: Compile Error
****************************************************************/