#include<iostream>
using namespace std;
int main(){
	int x, n, i,t,N=0,T;
	cin >> n >> x;
		for (t = 1; t <= n; t++)
		{
			
			T = t;
		
			for (i = 1; i <= (10 ^ 6); i = i * 10)
			{
				if ((T-i*x)%(i*10)==0)
				{
					N = N + 1;
					T = T - i * x;
				}
				else if (T<=0)
				{
					break;
				}
				
				else
				{
					T = T - (T % (i * 10));
				}
			
			
			
			
			
			}


		}
		printf("%d", N);
		return 0;

}