input = open("./test.txt", "r")

total = 0

for line in input:
  trimmedLine = line.replace("\n", "")
  elves = trimmedLine.split(",")
  elf1 = elves[0].split("-")
  elf1 = [int(elf1[0]), int(elf1[1])]
  elf2 = elves[1].split("-")
  elf2 = [int(elf2[0]), int(elf2[1])]
  if (elf1[0] <= elf2[0] and elf1[1] >= elf2[1]):
    total += 1
  elif (elf2[0] <= elf1[0] and elf2[1] >= elf1[1]):
    total += 1
  elif(elf1[0] >= elf2[0] or elf)

print(total)