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

/**************************************************************
	Problem: 1395
	User: zzz
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/