#include<iostream>
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: wengzihang
	Language: C++
	Result: Accepted
	Time:70 ms
	Memory:2072 kb
****************************************************************/