import java.util.Scanner;
public class pangkatloop {

public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int x = input.nextInt();
int y = input.nextInt();
int i,j,temp1=0,temp2=x,hasil=0;

for (i=1; i<=y; i++){
for (j=1; j<=(x-1); j++){
temp2=temp2+temp1;
}
temp1=temp2;
}
hasil=temp2;
System.out.println(hasil);
}
}