Without delay, let's solve this. We've got 603 and we will be multiplying it by 4, that is, adding 603 to itself 4 times.
Step 1: 0 + 603 = 603
Step 2: 603 + 603 = 1206
Step 3: 1206 + 603 = 1809
Step 4: 1809 + 603 = 2412

So, 603*4 = 2412