#include <stdio.h>

int main(void)
{
	int a, n, i, sum = 0, a_copy;
	printf("Please input a,n:");
	scanf("%d,%d", &a, &n);
	a_copy = a;
	for(i = 0; i < n; i++)
	{
		sum += a;
		a = a * 10 + a_copy; 
	}
	printf("\na+aa+...=%d", sum);
	return 0;
}