Question

I'm having problems with understanding how to set up a graph for a question. The subject is producer surplus. The question goes like this: I'm willing to pay up to
The more days you work, the more tedious your job becomes and the more fun you miss out on. So your psychological cost of working goes like this:
$70 for your 1st day of work per week,
$80 for your 2nd day of work per week,
$90 for your 3rd day of work per week,
$100 for your 4th day of work per week,
$110 for your 5th day of work per week,
$120 for your 6th day of work per week,
$130 for your 7th day of work per week,


If your job pays $85 per day and you work all the days where the pay is above your seller cost, what is your producer surplus?

I can get the solution myself if I understood how to set it up.