import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;
class Result {
/*
* Complete the 'getTotalX' function below.
*
* The function is expected to return an INTEGER.
* The function accepts following parameters:
* 1. INTEGER_ARRAY a
* 2. INTEGER_ARRAY b
*/
public static int getGCD(int n1, int n2) {
if (n2 == 0) {
return n1;
}
return getGCD(n2, n1 % n2);
}
public static int getLCM(int n1, int n2) {
if (n1 == 0 || n2 == 0)
return 0;
else {
int gcd = getGCD(n1, n2);
return Math.abs(n1 * n2) / gcd;
}
}
public static int getTotalX(List<Integer> a, List<Integer> b) {
// Write your code here
int result = 0;
int lcm = a.get(0);
for (Integer integer : a)
lcm = getLCM(lcm, integer);
int gcd = b.get(0);
for (Integer integer : b)
gcd = getGCD(gcd, integer);
int i = 0;
while (i <= gcd) {
i += lcm;
if (gcd % i == 0)
result++;
}
return result;
}
}
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
String[] firstMultipleInput = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");
int n = Integer.parseInt(firstMultipleInput[0]);
int m = Integer.parseInt(firstMultipleInput[1]);
List<Integer> arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
.map(Integer::parseInt)
.collect(toList());
List<Integer> brr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
.map(Integer::parseInt)
.collect(toList());
int total = Result.getTotalX(arr, brr);
bufferedWriter.write(String.valueOf(total));
bufferedWriter.newLine();
bufferedReader.close();
bufferedWriter.close();
}
}
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