Solution
for this case we need to take in count the PEDMAS rule Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).
And we have the following number
628
Step 1: 4 ÷ (1+1)x 157 -2x162
Step 2: 4 ÷ (1+1)x 157 -324
Step 3: 4÷2 x 157 -324
Step 4: 314x2 -324
Step 5: 628-324
Step 6: 628