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

    cout<<a<<endl;
}    
/**************************************************************
	Problem: 1395
	User: chenjunlin
	Language: C++
	Result: Compile Error
****************************************************************/