Up above I linked a short story written by a man with HSAM. Here's an excerpt that's a dialogue between himself and someone else with the condition:
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“How many have you seen?” I asked her.
She went on looking at the dog. She blinked a couple times.
“Are you allergic to dogs?” I asked her.
“Yeah,” she said. “I’ve seen sixteen Pomeranians in my life.”
“Nice. I’ve seen, uh.”
We were silent two minutes while I counted.
“I’ve seen fifty-eight Pomeranians.”
“Shit, that’s a lot of Pomeranians.”
“Well, you see them on the train in Tokyo sort of a lot.”
“How many poodles have you seen?”
“Fourteen,” I said.
“You answered very quickly.”
“I counted them a few months ago.”
“Why did you count them?”
“I was trying to get to sleep. I count memories when I am going to sleep.”
“That’s interesting.”
“It’s gotten more interesting as I’ve gotten older. It’s like Memory Golf: I try to think of things that have only happened between three and five times.”
“Why three and five times?”
“It’s hypnotic,” I said. “Three or five times gives you a little slice of every part of your life. You can write a complete and thorough autobiography about anything that’s happened to you between three and ten times.”
“Why not more than ten times?”
“Then it’d be too long.”
“How many cups of coffee have you drunk in your life?”
“Whoa — whoa. Please don’t ask me that. I’ll start counting and then I’ll slip into a coma for a year.”
“Sorry. Now I am thinking about it too. Oh no. I hate it.”
“You have to be careful with this stuff. You can’t write an autobiography about all the cups of coffee you drank, or all the times you’ve used the toilet. It has to be something that’s happened between three and ten times.”
“Not about something that happened twice?”
“No. It might just be a coincidence.”
“Not about something that happened once?”
“Maybe I’m wrong.”
“Maybe you’re not.”
“Whenever I tell people about this, I use the example that I’ve eaten a cinnamon bun thirty-two times in my life.”
“How many times have you told people that you’ve eaten a cinnamon bun thirty-two times?”
“Uh, nine.”
“You could write a complete and thorough autobiography about the nine times you told someone you’ve eaten a cinnamon bun thirty-two times.”
“I’m going to have a stroke if I think about that.”