import java.io.*;
import java.util.*;
import java.math.*;
public class Solution{
public static void main(String[] args) {
Scanner cin = new Scanner(new BufferedInputStream(System.in));
BigDecimal c;
BigDecimal d;
while(cin.hasNext()){
int a = cin.nextInt();
int b = cin.nextInt();
c = BigDecimal.valueOf(a);
d = BigDecimal.valueOf(b);
BigDecimal t = c.pow(b).subtract(d.pow(a));
System.out.println(t);
}
}
}