require "date"

$num = 0

def count(d)
    mon = d.mon
    a = d.day / 10
    b = d.day % 10
    if (mon == (a + b))
         $num += 1
    end
end

crnt = Date.new(2015, 1, 1)
count(crnt)
loop {
    crnt += 1
    if crnt.year != 2015
        break 
    end
    count(crnt)
}

puts $num