In my application i'm using solver.In this i created a `Decision` function that is working fine. But i want to use `Decision` function in `Math.Exp` function. For better understanding refer source code below,

```
using Microsoft.SolverFoundation.Services;
using Microsoft.SolverFoundation.Solvers;

SolverContext context = SolverContext.GetContext();
Model model = context.CreateModel();

Decision sv = new Decision(Domain.RealNonnegative, "decision");           
model.AddDecision(sv);  

model.AddConstraint("limits", 5 <= sv <= 20);

model.AddGoal("Result", GoalKind.Minimize, (1 - Math.Exp(sv));//here i'm getting exception

```

Please guide me how to use solver decision in `Math.Exp` function. This one required for my project requrement.