Problem:
Score : 400 points

Problem Statement

Given are a sequence A= {a_1,a_2,......a_N} of N positive even numbers, and an integer M.

Let a semi-common multiple of A be a positive integer X that satisfies the following condition for every k (1 \leq k \leq N):

There exists a non-negative integer p such that X= a_k \times (p+0.5).

Find the number of semi-common multiples of A among the integers between 1 and M (inclusive).

Constraints

1 \leq N \leq 10^5

1 \leq M \leq 10^9

2 \leq a_i \leq 10^9

a_i is an even number.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N M
a_1 a_2 ... a_N

Output

Print the number of semi-common multiples of A among the integers between 1 and M (inclusive).

Sample Input 1

2 50
6 10

Sample Output 1

2

15 = 6 \times 2.5

15 = 10 \times 1.5

45 = 6 \times 7.5

45 = 10 \times 4.5

Thus, 15 and 45 are semi-common multiples of A. There are no other semi-common multiples of A between 1 and 50, so the answer is 2.

Sample Input 2

3 100
14 22 40

Sample Output 2

0

The answer can be 0.

Sample Input 3

5 1000000000
6 6 2 6 2

Sample Output 3

166666667

Solution in Java (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.*;
import java.io.*;
public class Main {

	public static void main(String[] args) throws Exception{
		int num = 998244353;

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		StringTokenizer st = new StringTokenizer(bf.readLine());
 		int n = Integer.parseInt(st.nextToken());
 		int m = Integer.parseInt(st.nextToken());
 		StringTokenizer st1 = new StringTokenizer(bf.readLine());
 		int[] array = new int[n];
 		
 		array[0] = Integer.parseInt(st1.nextToken());
 		int currlcm = array[0]/2;
 		int ans = 0;
 		int temp = v2(array[0]/2);
 		for(int i = 1;i<n;i++){
//	 		String input1 = bf.readLine().trim();
//	 		String input2 = bf.readLine().trim();
	 		array[i] = Integer.parseInt(st1.nextToken());
	 		if (v2(array[i]/2) != temp){
	 			out.println(0);
	 			out.close();
	 		}
	 		currlcm = currlcm*(array[i]/2)/gcd(currlcm, array[i]/2);
 		}
 		
 		
 		
 		out.println((m/currlcm+1)/2);
	 		
 		out.close();
 		
 		
 		
 	}
	public static int gcd(int a, int b){ 
	      if (b == 0) 
	        return a; 
	      return gcd(b, a % b);  
	    }
	public static int v2(int n){
		int count = 0;
		int temp = n+0;
		while(temp%2 == 0){
			temp/=2;
			count++;
		}
		return count;
	}
}
 	
 
//StringJoiner sj = new StringJoiner(" "); 
//sj.add(strings)
//sj.toString() gives string of those stuff w spaces or whatever that sequence is