import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
      int a,b,c,r;
      Scanner  sc =new Scanner(System.in);
      a=sc.nextInt();
      b=sc.nextInt();
      if (a<b) {
          c=a;
          a=b;
          b=c;
      }  
      r=a%b;
while(r!=0){
a=b;
b=r;
r=a%b;
}
System.out.println(b);
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz