It was on last nite and im trying to figure out if its episode #51,#52 or #53. im lost HELP!!

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I <3 LUCY!
Lucy" I saw a sign that said take one so i took one.After that i took anything even if it didnt say take on. I took a bright new bicycle, a shiny new penny. I even took a little boy... yeah but my mommy made me take him back."

It's 52 in it's first run. Two episodes of it's spinoff "The Ropers" were added in 1982 into the syndication package, but most people go with #52 and count the two episodes seperatly.