can't do cash. you want to do something below $20. for doorman it differs a little on the city. tip up a little bit, you don't want to be stingy with the doorman. you may notice your packages don't arrive as quickly. all those different things do happen. $20 at least for them. >> and again, is it -- do you tip on seniority, for example. like the doorman compared to like the elevator man or somebody who handles your packages? is it seniority or -- >> it's seniority and the amount of contact you have with that person. they get more money than the person you see once a week. >> obviously nanny, day case, people who are caring for your kids? >> yes, yes. >> want your kids to be. >> exactly. >> with the nannies, it's pretty straightforward. one week's salary at least. there's not a lot of wiggle room. fan anies expect that nowadays. you do have a little more flexibility. at least $25 per each day care provider.