$($Difficulty: $*)$ A music song recorded in a studio is stored as a digital sequence on a CD$.$ The analog signal representing the music is $2$ minutes long and is sampled at a frequency $f_s=44100s^{-1}.$ How many samples should be stored on the CD$?$ Write the number of samples without commas or dots. Assume that the audio file is mono, or in other words, single channel.