#include <iostream>

using namespace std;

typedef long long LL;

int main(){
	int x,n;
	
	cin >> x >> n;
	
	LL ans = 0,t = 0;
	
	for(int i = 1;i <= n;i ++){
		
		t = t * 10 + x;
		ans = ans + t;
	}
	
	cout << ans << endl;
	return 0;
}