[maxmsp] Please help me!

I need to create a patch that plays a chord when you play a note on either the qwerty or the MIDI keyboard; I've been given this help but this is a new language to me so I hope someone can point me in the right direction.....
For the first of these you're going to need to identify the pitch value of the played note and then calculate the intervals between this and the other notes in the chord. So, if your played note has a pitch value of 60 and you want to play back a major chord, the next note is the third of the scale, which is four semitones above the first (the 'root'), so the value you want is 64. So, connect the first note value to a + 4 object and route the result back into the playback cycle. Similarly, the third note of the chord is seven semitones above the first, so what do you do? 

Of course, if you include number boxes going into the left inlets of the + objects you can vary the values on the fly. Or use preset objects to do the same with different values. See what you can come up with.