C :

#include<stdio.h>
int main()
{
	int i,n,b,t,c=0;
	scanf("%dd",&n);
	for(i=1;i<=n;i++)
	{
		t=i;
		while(t>0)
		{
			b=t%10;
			if(b==0)
			{
				c++;
				break;
			}
			t=t/10;
		}
	}
	printf("%d",c);
	return 0;
}

C++ :

#include <iostream>
using namespace std;

int main(){
	int i,n,c = 0;
	cin>>n;
	for(i = 1;i <= n;i++){
		if(i <= 99){
			if(i%10==0){
				c++;
			}
		}else{
			if(i/10%10==0||i%10==0){
				c++;
			}
		}
	}
	cout<<c;
}

Java :

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt(),i,c=0;
		for(i=1;i<=n;i++) {
			if(i%10 == 0 && i/10%10!= 0) {
				c++;
			}
			if(i/10 >=10 && i/10%10 == 0 && i%10 != 0) {
				c++;
			}
			if(i/10 >=10 && i/10%10 == 0 && i%10 == 0) {
				c++;
			}
			}
		System.out.println(c);
	}
}

Python :

n = int(input())
c = 0
for i in range(10, n + 1):
    s = i // 10 % 10
    g = i // 1 % 10
    if s == 0 or g == 0:
        c += 1
print(c)