#include<stdio.h>
long fun(int a, int n)
{
int i;
long sum;
sum = a;
long f = a;
for (i = 0; i < n - 1; i++)
{
f = f * 10 + a;
sum += f;
}
return sum;
}
int main()
{
int a, n;
printf("输入a和n的值:");
scanf_s("%d,%d", &a, &n);
long sum = fun(a, n);
printf("sum=%d\n", sum);
return 0;
}