Greatest Common Divisor

import java.util.Scanner;

public class GreatestCommonDivisor {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = Integer.parseInt(scanner.nextLine());
        int b = Integer.parseInt(scanner.nextLine());

        while ( b !=0){
            int temp = b;
            b = a % b;
            a = temp;

        }
        System.out.println(a);
    }
}