/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
 
public static int gcd(int n, int m){
   if (m == 0)
       return n;
   return gcd(m, n % m);
 
}
public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    int n = input.nextInt();
    int m = input.nextInt();
    System.out.println(gcd(n, m));
 
}
 
 
}

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