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
P = [1 for _ in range(10**5)]
P[0]=0
P[1]=0
for i in range(2,int((10**5)**0.5)+1):
    for j in range(i*i,10**5,i):
        P[j]=0
Q = []
for i in range(3,10**5,2):
    if P[i]==1 and P[(i+1)//2]==1:
        Q.append(i)
A = [0 for _ in range(10**5+1)]
for q in Q:
    A[q] = 1
for i in range(1,10**5+1):
    A[i] += A[i-1]
Q = int(input())
for _ in range(Q):
    l,r = map(int,input().split())
    print(A[r]-A[l-1])