sgu-112(java 大数)

import java.util.*;
import java.math.*;

public class Solution {
    public static void main(String args[]){
        Scanner in=new Scanner(System.in);
        int a=in.nextInt();
        int b=in.nextInt();
        BigInteger x=BigInteger.valueOf(a);
        BigInteger y=BigInteger.valueOf(b);
        x=x.pow(b);
        y=y.pow(a);
        System.out.println(x.subtract(y));
    }
}