import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws Exception {
        // TODO ?????????????????????????????????????????????
        
        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
            String line;
            line=br.readLine();
            String[] x=line.split(" ");
            int a=Integer.parseInt(x[0]);
            int b=Integer.parseInt(x[1]);
            int store=0;
            for(int i=1;i<Integer.min(a, b)+1;i++){
            	if(a%i==0&&b%i==0){
            		store=i;
            	}
            }
            System.out.println(store);
        }
	}

}
/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