We say that a odd number N is similar to 2017 when both N and (N+1)/2 are prime.

You are given Q queries.

In the i-th query, given two odd numbers l_i and r_i, find the number of odd numbers x similar to 2017 such that l_i ≤ x ≤ r_i.

Constraints

* 1≤Q≤10^5
* 1≤l_i≤r_i≤10^5
* l_i and r_i are odd.
* All input values are integers.

Input

Input is given from Standard Input in the following format:


Q
l_1 r_1
:
l_Q r_Q


Output

Print Q lines. The i-th line (1≤i≤Q) should contain the response to the i-th query.

Examples

Input

1
3 7


Output

2


Input

4
13 13
7 11
7 11
2017 2017


Output

1
0
0
1


Input

6
1 53
13 91
37 55
19 51
73 91
13 49


Output

4
4
1
1
1
2
Q = int(input())
qs = [tuple(map(int,input().split())) for i in range(Q)]

MAXN = 10**5+10
sieve = [0,0] + [1]*MAXN
p = 2
while p*p <= MAXN:
    if sieve[p]:
        for q in range(2*p,MAXN+1,p):
            sieve[q] = 0
    p += 1

cums = [0]
for i in range(1,MAXN):
    valid = sieve[i] and sieve[(i+1)//2]
    cums.append(cums[-1] + int(valid))

for l,r in qs:
    ans = cums[r] - cums[l-1]
    print(ans)