Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

The problem statement has recently been changed. View the changes.

×
D. Flowers

time limit per test

1.5 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputWe saw the little game Marmot made for Mole's lunch. Now it's Marmot's dinner time and, as we all know, Marmot eats flowers. At every dinner he eats some red and white flowers. Therefore a dinner can be represented as a sequence of several flowers, some of them white and some of them red.

But, for a dinner to be tasty, there is a rule: Marmot wants to eat white flowers only in groups of size *k*.

Now Marmot wonders in how many ways he can eat between *a* and *b* flowers. As the number of ways could be very large, print it modulo 1000000007 (10^{9} + 7).

Input

Input contains several test cases.

The first line contains two integers *t* and *k* (1 ≤ *t*, *k* ≤ 10^{5}), where *t* represents the number of test cases.

The next *t* lines contain two integers *a*_{i} and *b*_{i} (1 ≤ *a*_{i} ≤ *b*_{i} ≤ 10^{5}), describing the *i*-th test.

Output

Print *t* lines to the standard output. The *i*-th line should contain the number of ways in which Marmot can eat between *a*_{i} and *b*_{i} flowers at dinner modulo 1000000007 (10^{9} + 7).

Examples

Input

3 2

1 3

2 3

4 4

Output

6

5

5

Note

- For
*K*= 2 and length 1 Marmot can eat (*R*). - For
*K*= 2 and length 2 Marmot can eat (*RR*) and (*WW*). - For
*K*= 2 and length 3 Marmot can eat (*RRR*), (*RWW*) and (*WWR*). - For
*K*= 2 and length 4 Marmot can eat, for example, (*WWWW*) or (*RWWR*), but for example he can't eat (*WWWR*).

Codeforces (c) Copyright 2010-2022 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: May/24/2022 08:12:09 (h2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|