The task is to generate the correct answer for a given math problem.

Input: Consider Input: Problem: how many numbers between 400 and 1000 can be made with the digits 2 , 3,4 , 5,6 and 0 ?

Output: 60


Input: Consider Input: Problem: in how many no . between 10 and 30 exactly two of the digits is 2 ?

Output: 1


Input: Consider Input: Problem: a train 50 m long takes 6 sec to cross a man walking at 5 kmph in a direction opposite to that of the train . find the speed of the train ?


Output: 25 kmph