instructions = [int(line.strip().replace("L","-").replace("R", "")) for line in open(0)]
dial = 50
count = 0

for turn in instructions:
  if turn < 0:
    div, mod = divmod(turn, -100)
    count += div
    if dial != 0 and dial + mod <= 0:
      count += 1
  else:
    div, mod = divmod(turn, 100)
    count += div
    if dial + mod >= 100:
      count += 1

  dial = (dial + turn) % 100

print(count)