数列求和 1134

//附上链接 https://acm.sdut.edu.cn/onlinejudge2/index.php/Home/Index/problemdetail/pid/1134.html
#include<iostream>
#include<cstdio>
#include<string.h>
#include<algorithm>
#include<stdlib.h>
#include<cmath>
using namespace std;

int main()
{
	int a, n;
	scanf("%d%d", &a,&n);
	int i;
	long long int sum=0,temp=0;
	for (i =1; i <= n; i++)
	{
		temp = temp * 10 + a;
		sum = sum + temp;
	}
	cout << sum << endl;
   	return 0;
}
//这种涉及到数学的题 动笔写写