computable but in fact intractable I mean even for chess it's already intractable to do that exactly and you know it could be also discounted kind of framework or so so having a hard horizon you know at number of years it's just for simplicity of discussing the model and also sometimes the mass is simple but there are lots of variations actually quite interesting parameter it's it's there's nothing really problematic about it but it's very interesting so for instance you think no let's let's pin let's let the parameter M tend to infinity right