i, j, k = [int(x) for x in input().split()]
beautifulDays = [1 for day in range(i, j+1) if (day - int(str(day)[::-1])) % k == 0]
print(sum(beautifulDays))

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        int i = in.nextInt();
        int j = in.nextInt();
        int k = in.nextInt();
        int count = 0;
        
        for (int a=i;j>a; a++){
            StringBuilder temp = new StringBuilder();
            temp.append(a);
            temp=temp.reverse();
            String temp1 = temp.toString();
            int aRev = Integer.parseInt(temp1);
            if(Math.abs((a-aRev)%k)==0){
                count++;
            }
        }
        
        System.out.println(count);
    }
}

#include<stdio.h>
int main()
{
int i=0,j=0,k=0,x=0,rem=0,sum=0,count=0;
scanf("%d%d%d",&i,&j,&k);
for(i;i<=j;i++)
{
x=i;
while(x!=0)
{
rem=x%10;
sum=(sum*10)+rem;
x=x/10;
}
if(abs(i-sum)%k==0)
count=count+1;
sum=0;
}
printf("%d",count);
return 0;
}

def beautifulDays(i, j, k):
    daycount = int(0)
    for x in range(i, j+1):
        if (x - int(str(x)[::-1])) % k == 0:
            daycount += 1
    return daycount