import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    final Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tmp = 0;
    int r = 0;
    
    if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    
    while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    }
    
    System.out.println(a);
  }
}
 import java.util.Scanner; Scanner java.util public class Main {
  public static void main(String[] args) {
    final Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tmp = 0;
    int r = 0;
    
    if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    
    while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    }
    
    System.out.println(a);
  }
} Main public static void main(String[] args) {
    final Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tmp = 0;
    int r = 0;
    
    if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    
    while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    }
    
    System.out.println(a);
  } main {
    final Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tmp = 0;
    int r = 0;
    
    if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    
    while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    }
    
    System.out.println(a);
  } final Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int tmp = 0; tmp 0 int r = 0; r 0 if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    } a < b a b {
      tmp = a;
      a = b;
      b = tmp;
    } tmp = a tmp a a = b a b b = tmp b tmp while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    } b > 0 b 0 {
      r = a % b;
      a = b;
      b = r;
    } r = a % b r a % b a b a = b a b b = r b r System.out.println(a) System.out.println System.out System System.out a String[] args args public class Main {
  public static void main(String[] args) {
    final Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tmp = 0;
    int r = 0;
    
    if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    
    while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    }
    
    System.out.println(a);
  }
} public class Main {
  public static void main(String[] args) {
    final Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tmp = 0;
    int r = 0;
    
    if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    
    while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    }
    
    System.out.println(a);
  }
} Main
import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    final Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tmp = 0;
    int r = 0;
    
    if (a < b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    
    while (b > 0) {
      r = a % b;
      a = b;
      b = r;
    }
    
    System.out.println(a);
  }
}

