#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,n,k=0,s=0,sb;
	cin>>n;
	for(sb=1;sb<=n;sb++){
		i=sb;
		s=0;
		while(i!=0){
			s=s+i%10;
			i/=10;
		}
		if(s%2==0||s%5==0) continue;
		k++;
			
	}
	cout<<k;
	
	
	return 0;
	}

/**************************************************************
	Problem: 1395
	User: fzy001
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/