Count unique data across multiple columns

I'm trying to count the number occurrences for each unique item across multiple columns. For example, I have following data across columns A, B, & C. It is a two-step process (1) figure out the unique items from all three columns as the data changes every day (2) count the number of occurrences for each unique item.

Column A
Apple
Orange
Pear
Grape
Carrot
Kiwi

Column B
Pear
Grape
Watermelon
Egg

Column C
Egg
Apple
Grape
Peanut

My desired output would be:
Apple 2
Orange 1
Pear 2
Grape 3
Carrot 1
Kiwi 1
Watermelon 1
Egg 2
Peanut 1

It's between 3 columns and 6 columns. 6 columns is the max. I think if I say 6, 3 will also work. Thanks