b = gets.to_i
if b < 10**3
	puts b
elsif b < 10**6
	puts "%.1fk" % (b.to_f/10**3)
elsif b < 10**9
	puts "%.1fM" % (b.to_f/10**6)
elsif b < 10**12
	puts "%.1fG" % (b.to_f/10**9)
else
	puts "%.1fT" % (b.to_f/10**12)
end