import strutils
var cnt = 0
for m in 1 .. 12:
  var n: int
  case m:
  of 2: n = 28
  of 4, 6, 9, 11: n = 30
  else: n = 31
  for d in 1 .. n:
    let w = $d
    var s = ($w[0]).parseInt
    if w.len >= 2: s += ($w[1]).parseInt
    if m == s: cnt += 1
echo cnt