'''
#print(round(132.56,-3))
n = int(input())
nums = []
for i in range(n):
    a = int(input())
    nums.append(a)
for i in nums:
    f=0
    for j in range(1,i+1):
        for k in range(1,i+1):
            if j*j + k*k == i:
                f = 1
                print("Yes")
                break
        if f == 1:
            break
    else:
        print("No")'''

N = int(input())
k = int(input())
Sum = 0
for i in range(1,N+1):
    for j in str(i):
        if j == str(k):
            Sum+=1
print(Sum)