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public class Test {
    public static void main(String[] args) {
    	int a = 165, b = 55;
        System.out.printf("%d 和 %d 的最大公约数是: %d\n", a, b, gcd(a, b));
    }

    public static int gcd(int a, int b) {
        // suppose a > b;
        int r = a % b;
        while (r != 0) {
        	a = b;
        	b = r;
        	r = a % b;
        }
        return b;
    }
}