#include<iostream>
using namespace std;

int main(){
	int a,b,sum;
	cin>>a>>b;
	for(int i=1;i<=b;i++){
		int b,g,s,q;
		if(g%10==0 || (s*10)/10==0 || (b*100)%100/10==0 || (q*1000)%1000/100==0){
		sum+=i;
	}
	cout<<sum;
	} 
	return 0;
}