
S = gets.chomp

case S
when "SUN" then
  puts '7'
when "MON" then
  puts '6'
when "TUE" then
  puts '5'
when "WED" then
  puts '4'
when "THU" then
  puts '3'
when "FRI" then
  puts '2'
when "SAT" then
  puts '1'
else 
  puts 'na'
end