#include <stdio.h>

int main(void) {
	int a,b,i,j;
	int kou = 1;
	int sum =0;
	scanf("%d %d",&a,&b);
	
	for(i=1;i<=a;i++){
		for(j=1;j<=b;j++){
			kou *=i;
			}
			sum += kou;
			kou = 1;
		}
		
	printf("%d",sum);
	return 0;
}