Azerbaijan Programming Olympiad - 2nd Stage preparation
Almost Prime Numbers
Almost prime numbers are the non-prime numbers which are divisible by only a single prime number. In this problem your job is to write a program which finds out the number of almost prime numbers within a certain range.
First line of the input file contains an integer n (n ≤ 600) which indicates how many sets of inputs are there. Each of the next n lines make a single set of input. Each set contains two integer numbers low and high (0 < low ≤ high ≤ 1012).
For each line of input except the first line you should produce one line of output. This line contains a single integer, which indicates how many almost prime numbers are within the range (inclusive) [low...high].
3 1 10 1 20 1 5
3 4 1