import junit.framework.TestCase;

public class ContinuousChange extends TestCase {
    public static int f(final int value) {
        if (value <= 10) {
            return value * 7;
        } else {
            return value * 9 - 20;
        }
    }
    public void test() {
        assertEquals(0, f(0));
        assertEquals(56, f(8));
        assertEquals(63, f(9));
        //
        assertEquals(70, f(10));
        //
        assertEquals(79, f(11));
        assertEquals(88, f(12));
    }
}