#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,s,d,f,g,h,j=0,k;
	cin>>a;
	for(k=10000;k<=a;k++){
		s=k%10;
		d=k/10%10;
		f=k/100%10;
		g=k/1000%10;
		h=k/10000;
		if(s%2==0&&d%2==0&&g%2==0&&h%2==0&&s%2==0){
			j=j+1;
		}
	}cout<<j;
}

/**************************************************************
	Problem: 1745
	User: tonghuawei
	Language: C++
	Result: Wrong Answer
****************************************************************/