include

using namespace std; int main(void) {

int a,n;
unsigned long long sum=0;
cin>>a>>n;
for(int i=1,num;i<=n;i++)
{
	num=a;
	for(int j=2;j<=i;j++)num=num*10+a;
	sum+=num;
}
cout<<sum;
return 0;

}