A formula element allows the developer to define formulas using functions and operators to manipulate data in an OmniScript. The output of the formula element can be displayed to the user immediately in the current step using a display element. The CONTIF function counts how many times a value appears in a list1. A Calculation Action element executes a calculation procedure and returns the output as a JSON object. A Set Values element assigns values to variables or fields in an OmniScript. A Range element defines a range of values for a variable or field in an OmniScript1. Based on best practice, a formula element is the most suitable element to use the CONTIF function in this scenario.