View Code of Problem 86

#include<stdio.h>
#include<string.h>
#include<math.h>

int main(){

	int a,b;
	
	scanf("%d%d",&a,&b);
	int k=a,sum=0;
	for(int i=0;i<b;i++){
		sum+=k;
		k=k+a*pow(10,i+1);

	}
	printf("%d",sum);

}