Problem: Karan's mathematics professor has given him a lots of homework. Since he is busy preparing for September Easy Challenge, he needs your help.

Given two numbers, find the sum of prime numbers between them, both inclusive. 

Input:

The first line contains the number of test cases T. Each test case contains two space separated integers.

Output:

Print the answer on a new line for each case.

Constraints:

1 ≤ T ≤ 100

1 ≤ a,b < 10^6

SAMPLE INPUT
1
1 5

SAMPLE OUTPUT
10

Solution (in PYTHON):

Solution:
def isprime(n):
	for i in range(2,int(n**0.5)+1):
		if n%i==0:
			return False
	return True
for p in range(input()):
	c=0
	a,b=map(int,raw_input().split())
	if a==1:
		a=a+1
	if b==1:
		print 0
		continue
	for i in range(a,b+1):
		if isprime(i):
			#print i
			c=c+i
	print c