Predictor expression

I am trying to create a predictor expression. I want to create an expression that returns 1 if the condition true. if deliveries greater than 50 and the organization unit name contains “DH”.

if(“DH”=~V{org_unit_name} and #{a8uLGfI8qPC}>=50,1,0)

the error was “Expression is not well-formed”

Please help to correct this expression.