Without delay, let's solve this. We've got 993 and we will be multiplying it by 4, that is, adding 993 to itself 4 times.
Step 1: 0 + 993 = 993
Step 2: 993 + 993 = 1986
Step 3: 1986 + 993 = 2979
Step 4: 2979 + 993 = 3972

So, 993*4 = 3972