#include<stdio.h>
int main() {
	int a, n;
	scanf("%d %d", &a, &n);
	int sum = 0;
	int t = a;//注意找规律a aa aaa 为a*10 再加上他本来的数而不是a变后的值
	for (int i = 0; i < n; i++) {
		sum = sum + a;
		a = a * 10 + t;
		
	}
	printf("%d",sum);
	return 0;
}