import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Arrays;
import java.util.ArrayList;
public class Main {
    //Program start
    
    //Program end

    @Test
public void test1() {
    assertEquals(7, largestInteger(new ArrayList<>(Arrays.asList(3,9,2,1,7)), 3));
}
@Test
public void test2() {
    assertEquals(3, largestInteger(new ArrayList<>(Arrays.asList(3,9,7,2,1,7)), 4));
}
@Test
public void test3() {
    assertEquals(-1, largestInteger(new ArrayList<>(Arrays.asList(0,0)), 1));
}

}