//elab-source: NumberBaseConverter.java
import java.util.Scanner;
public class NumberBaseConverter {
    public static void main(String [] args) {
        Scanner input = new Scanner(System.in);
        int ans = 0,counter = 0,count = 0;
        System.out.print("Input B = ");
        int b = input.nextInt();
        System.out.printf("Input number in base %d : ",b);
        int numInBase = input.nextInt();
        String Base = b+"";
        count = Integer.toString(numInBase).length()-1;
        while (count>=0){
            ans += Math.pow(b,count)*Integer.parseInt(Integer.toString(numInBase).substring(counter, counter+1));
            counter++;
            count--;
        }
        System.out.printf("%d base %d is equal to %d.",numInBase,b,ans);

    }

}