n,k = map(int,input().split())
#n = 11,k =  1
a = [str(i) for i in range(1,n+1)]
#a = 1,2,3,4,5,6,7,8,9,10,11
b = ''.join(a)
#b = "1234567891011"
print(b.count(str(k)))