counts, n = [], 100000
n.times do
	count = 0
	3.times do
		count2, toss = 0, 0
		while toss != 7
			count2 +=1
			toss = rand 20
		end
		count += count2
	end
	counts += [count]
end
p counts.min, counts.max, counts.inject(:+)/counts.size.to_f

your_case = 0
counts.each { |i| if i > 165 then your_case += 1 end }
p your_case/(n/100.0)