Let's get this math done. We have 339 and we're going to multiply it by 4. This is the same as taking 339 and adding it to itself 4 times.
Step 1: 0 + 339 = 339
Step 2: 339 + 339 = 678
Step 3: 678 + 339 = 1017
Step 4: 1017 + 339 = 1356

So, 339*4 = 1356