$5$

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References

$\backslash$table$[[$Chewing gum,Wm$.$ Wrigley, Mondelez, Hershey,$94],[$Soft drinks,Coca$-$Cola, PepsiCo, Dr Pepper Snapple, Cott $($RC Cola$),94],[$Breakfast cereals,Kelloggs, General Mills, Ralcorp, PepsiCo $($Quaker Oats$),92],[$Toothpaste$,$Colgate$-$Palmolive, Procter & Gamble, Church & Dwight, Beecham,$91],[$Detergents$,$Procter & Gamble, Lever Bros., Dial, Colgate$-$Palmolive,$90],[$Art auctions,Sotheby's, Christie's,$90],[$Greeting cards,Hallmark, American Greetings, Gibson,$88],[$Canned soup,Campbell, Progresso, Heinz,$85],[$Beer$,$Anheuser$-$Busch, MillerCoors, Constellation, Heineken,$80],[$Computer printers,Hewlett$-$Packard, Canon, Epson, Brother,$70]]$

In how many markets do fewer than three firms produce at least $80$ percent of total output?

instructions: Enter your response as a whole number.

market$($s$)$