Package for this problem was not updated by the problem writer or Codeforces administration after we’ve upgraded the judging servers. To adjust the time limit constraint, solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then value 800 ms will be displayed and used to determine the verdict.

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

D. Safe

time limit per test

5 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputVasya tries to break in a safe. He knows that a code consists of *n* numbers, and every number is a 0 or a 1. Vasya has made *m* attempts to enter the code. After each attempt the system told him in how many position stand the right numbers. It is not said in which positions the wrong numbers stand. Vasya has been so unlucky that he hasn’t entered the code where would be more than 5 correct numbers. Now Vasya is completely bewildered: he thinks there’s a mistake in the system and it is self-contradictory. Help Vasya — calculate how many possible code variants are left that do not contradict the previous system responses.

Input

The first input line contains two integers *n* and *m* (6 ≤ *n* ≤ 35, 1 ≤ *m* ≤ 10) which represent the number of numbers in the code and the number of attempts made by Vasya. Then follow *m* lines, each containing space-separated *s*_{i} and *c*_{i} which correspondingly indicate Vasya’s attempt (a line containing *n* numbers which are 0 or 1) and the system’s response (an integer from 0 to 5 inclusively).

Output

Print the single number which indicates how many possible code variants that do not contradict the *m* system responses are left.

Examples

Input

6 2

000000 2

010100 4

Output

6

Input

6 3

000000 2

010100 4

111100 0

Output

0

Input

6 3

000000 2

010100 4

111100 2

Output

1

Codeforces (c) Copyright 2010-2019 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Sep/21/2019 18:07:10 (e2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|