l = input().split()
a=int(l[0])
b=l[1]
c=[]
for i in range(1,a+1):
    if i<10:
        c.append(i)
    else:
        i=str(i)
        i=list(i)
        c= c+i
c=list(map(str,c))
d=c.count(b)
print(d)