Given

When you power a number by a determined exponent "n" it means that you are multiplying said number n-times by itself. We know that if you multiply 1 by 1 the result is 1, no matter how many times you do it, then 1 multiplied 5 times by itself is also equal to 1:

Then, you can write the calculation as:

Solve the addition in the denominator's place and then solve the division

The result of the calculation is 4