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import java.io.BufferedReader;                                                  
import java.io.IOException;                                                     
import java.io.InputStreamReader;                                               
                                                                                
public class row {                                                              
                                                                                
    public static void main(String args[]) throws IOException{                  
                                                                                
        BufferedReader inn = new BufferedReader(new                             
        InputStreamReader(System.in));                                          
        String[] arg = inn.readLine().split(" ");                               
                                                                                
        long k = Long.valueOf(arg[0]);                                          
        long a = Long.valueOf(arg[1]);                                          
        long b = Long.valueOf(arg[2]);                                          
                                                                                
        inn.close();                                                            
                                                                                
        int result = 0;
        long maxCount=1458;
        long minCount=1;
        long digits = b;
        
        if(k*1458>b){
            maxCount = b/k; 
        }
        
        if(k*1<a){
            minCount=a/k+1;
        }
        
        for(long i=minCount; i<maxCount; i++){
            digits=k*i;
            long sum=0;
            long rest=0;
            while(digits>0){                                                    
                rest = digits%10;                                                   
                sum += rest*rest;                                                   
                digits /= 10;                                                       
                }                                   
            if(sum==i){
                result++;
            }
        }
        System.out.println(result);
        System.exit(0);                                                         
                                                                                
    }                                                                           
                                                                                
}