#include<bits/stdc++.h>
using namespace std;
int main(){
int i,n,g,s,b,q,w,h=0;
	cin>>n; 
	for(i=10000;i<=n;i++){
		g=i%10;
		s=i/10%10;
		b=i/100%10;
		q=i/1000%10;
		w=i/10000;
		if(g%2==0&&s%2==0&&b%2==0&&q%2==0&&w%2==0){
			h++;
		}
	}
	cout<<h;
	return 0;
}
/**************************************************************
	Problem: 1745
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/