View Code of Problem 86

#include<cstdlib>
#include<cmath>
#include<cstdio>
#include<algorithm>
#include<iostream>
#include<cstring>
using namespace std;
int main(){
    int a,n;
	scanf("%d%d",&a,&n);
	int sum=0,s=a;
	for(int i=1;i<=n;i++)
	{
		   sum+=s;
		   a*=10;
		   s+=a;
	}
	printf("%d\n",sum);
	return 0;
}