D = {
  "57": 1,
  "-1": 2,
  "1":  3,
  "31": 4,
  "19": 5,

  "76": 6,
  "58": 7,
  "11": 8,
  "Al": 9,
  "16": 10,

  "20": 11,
  "NO": 12,
  "66": 13,
  "92": 14,
  "26": 15,

  "9.": 16,
  "US": 17,
  "73": 19,
  
  "po": 22,
  "2":  23,
  "Wi": 24
}

s = input()

if s[0:2] in D:
    print(D(s[0:2]))
elif s[2] == "5":
    print("18")
else:
    t = input()
    if t[0] != "1":
        print("20")
    else:
        print("21")