#include<stdio.h>
int main()
{
	int i,a,b,c,n,d,s=0,e;
	scanf("%d",&n);
	for(i=10000;i<=n;i++)
	{
		a=i/10000;
		b=i/1000%10;
		c=i/100%10;
		d=i/10%10;
	    e=i%10;
		if(a%2==0&&b%2==0&&c%2==0&&d%2==0&&e%2==0)
			s++;
	}
	 printf("%d",s);
	 return 0;
 } 
/**************************************************************
	Problem: 1745
	User: admin
	Language: C
	Result: Accepted
	Time:13 ms
	Memory:1144 kb
****************************************************************/