Without delay, let's solve this. We've got 377 and we will be multiplying it by 4, that is, adding 377 to itself 4 times.
Step 1: 0 + 377 = 377
Step 2: 377 + 377 = 754
Step 3: 754 + 377 = 1131
Step 4: 1131 + 377 = 1508

So, 377*4 = 1508