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import java.util.*;
public class Main {
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
while (sc.hasNext()){
List<Integer> stoma=new ArrayList<>();
List<Integer> bag=new ArrayList<>();
String tmp1=sc.nextLine();
String[] tmp11=tmp1.split(" ");
for (int i=0;i<tmp11.length;i++)
stoma.add(Integer.parseInt(tmp11[i]));
String tmp2=sc.nextLine();
String[] tmp22=tmp2.split(" ");
for (int i=0;i<tmp22.length;i++)
bag.add(Integer.parseInt(tmp22[i]));
Collections.sort(stoma);
Collections.sort(bag);
int res=0;
boolean flag=false;
for (int i=0;i<stoma.size();i++){
int tmp=stoma.get(i);
flag=false;
for (int j=bag.size()-1;j>=0;j--){
if (bag.get(j)>=tmp){
flag=true;
bag.remove(j);
break;
}
if (bag.get(j)<tmp)
break;
}
if (flag)
res++;
}
System.out.println(res);
}
}
}
/**
* Created by dcp on 2018/9/16.
*/
/**
* Created by dcp on 2018/9/16.
*/
/**
* Created by dcp on 2018/09/16.
*/
var readline=require("readline");
var r1=readline.createInterface({
input:process.stdin,
output:process.stdout
});
r1.on("line",function(data){
console.log(jumpFloor(data))
});
function jumpFloor(number)
{
// write code here
if(number==0){
return 0;
}
if(number==1){
return 1;
}
if(number==2){
return 2;
}
var a=1,b=2,temp=0;
for(var i=3;i<=number;i++){
temp=a+b;
a=b;
b=temp;
}
return temp;
}
import java.util.Scanner;
public class Main {
public static String res="";
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
while (sc.hasNext()){
int N=sc.nextInt();
int count=0;
for (int i=1;i<=N;i++){
if (goodNumber(i)){
int now=Integer.valueOf(res);
if (now!=i){
count++;
}
}
}
System.out.println(count);
}
}
private static boolean goodNumber(int n){
String a=String.valueOf(n);
res="";
for (int i=0;i<a.length();i++){
if (a.charAt(i)=='0'||a.charAt(i)=='1'||a.charAt(i)=='8'){
res+=a.charAt(i);
}else if (a.charAt(i)=='2'){
res+="5";
}else if (a.charAt(i)=='5'){
res+="2";
}else if (a.charAt(i)=='6'){
res+="9";
}else if (a.charAt(i)=='9'){
res+="6";
}else return false;
}
return true;
}
}