m,n = input().split() #'100' '120' m,n = int(m),int(n) d = 0 for i in range(m,n+1): a = i // 100 b = i//10 %10 c = i%10 if i == a*a*a + b*b*b + c*c*c: #i是三位数; a,b,c是三个数码 #print(i) d = d +1 print(d)