package simple_calculation;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.util.Scanner;

public class SimpleCalculation {

private static int difference(long numberOfSystem){

int sum = 0;

int multi = 1;

while (numberOfSystem > 0){

long number = numberOfSystem % 10;

sum += number;

multi *= number;

numberOfSystem /= 10;

}

return multi - sum;

}

public static void main(String[] args) throws IOException {

Scanner sc = new Scanner(new FileReader("input.txt"));

long numberIn = sc.nextLong();

int numberSystem = sc.nextInt();

long numberOfSystem = Long.parseLong(Long.toString(numberIn, numberSystem));

long result = difference(numberOfSystem);

FileWriter out = new FileWriter("output.txt");

out.write(String.valueOf(result));

out.close();

}

}