DWITE '06 R5 #5 - Prime Palindromes

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Points: 10
Time limit: 0.6s
Memory limit: 16M

Problem types
DWITE Online Computer Programming Contest, February 2006, Problem 5

The number 181 is a prime palindrome because it is both a prime number and a palindrome. A palindrome is a number that is the same when read forward as backward. Write a program that determines how many prime palindromes there are between two numbers.

The input will contain five sets of data. Each set will contain two integers, L and U, the range of numbers to determine the prime palindromes. 2 \le L \le U \le 999\,999.

The output will contain the number of prime palindromes between L and U, inclusive.

Sample Input (3 sets of data only)

2 10
100 200
10000 20000

Sample Output



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