If else conditional on survey platform

I am trying to change an option value, based on some values given by the user in previous questions. Ideally in html that would mean using an if else condition. However, I am not sure how that would work on the qualtrics platform. For eg. If in question 1 the user puts a value of 59 in Question 2, the option displayed should be 600 if the value in q1 is above 40 and 400 if it's below 40. Piping allows applying a mathematical formula, but when I enter an if else statement there, it says invalid expression.