import java.util.*;
public class main{
    public static void main(String[] args) {
        try{
            int x,y,z;
            Scanner in=new Scanner(System.in);
            x=abs(in.nextInt());
            y=abs(in.nextInt());
            z=abs(in.nextInt());
            in.close();
            
            System.out.print(gcd(gcd(x,y),z));
        }catch(Exception e){
            System.out.println("Input error!");
        }
    }
    public static int gcd(int a,int b)
    {
    	if(a<b)
    	{
    		int tmp=b;
    		b=a;
    		a=tmp;
    	}
    	if(a%b!=0)
    		return gcd(b,a%b);
    	else
    		return b;
    }
    
    public static int abs(int a)
    {
    	if(a>0)
    		return a;
    	else
    		return -a;
    }
    
};