import bisect import copy import decimal import fractions import heapq import itertools import math import random import sys from collections import Counter, deque,defaultdict from functools import lru_cache,reduce from heapq import heappush,heappop,heapify,heappushpop,_heappop_max,_heapify_max def _heappush_max(heap,item): heap.append(item) heapq._siftdown_max(heap, 0, len(heap)-1) def _heappushpop_max(heap, item): if heap and item < heap[0]: item, heap[0] = heap[0], item heapq._siftup_max(heap, 0) return item from math import gcd as GCD read=sys.stdin.read readline=sys.stdin.readline readlines=sys.stdin.readlines class Prime: def __init__(self,N): self.smallest_prime_factor=[None]*(N+1) for i in range(2,N+1,2): self.smallest_prime_factor[i]=2 n=int(N**.5)+1 for p in range(3,n,2): if self.smallest_prime_factor[p]==None: self.smallest_prime_factor[p]=p for i in range(p**2,N+1,2*p): if self.smallest_prime_factor[i]==None: self.smallest_prime_factor[i]=p for p in range(n,N+1): if self.smallest_prime_factor[p]==None: self.smallest_prime_factor[p]=p self.primes=[p for p in range(N+1) if p==self.smallest_prime_factor[p]] def Factorize(self,N): assert N>=1 factorize=defaultdict(int) if N<=len(self.smallest_prime_factor)-1: while N!=1: factorize[self.smallest_prime_factor[N]]+=1 N//=self.smallest_prime_factor[N] else: for p in self.primes: while N%p==0: N//=p factorize[p]+=1 if N0 divisors=[1] for p,e in self.Factorize(N).items(): A=[1] for _ in range(e): A.append(A[-1]*p) divisors=[i*j for i in divisors for j in A] K,N=map(int,read().split()) def hash(n): if n<10: return n s=0 while n>=10: s+=n%10 n//=10 s+=n return hash(s) P=Prime(2*10**5) primes=[p for p in P.primes if K<=p<=N] lst=[hash(p) for p in primes] m=0 ans=None for i in range(N+1): for d in range(1,11): j=i+d if N