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




	return 0;
}


/**************************************************************
	Problem: 1395
	User: lzc
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/