import os

if (os.path.isfile("./input")):
    input = open("./input", "r").read()
else:
    input = "3-5\n10-14\n16-20\n12-18\n\n1\n5\n8\n11\n17\n32\n"

input = input[:-1]

isList = True
fresh = []
c = 0
for line in input.split('\n'):
    if (line == ""):
        isList = False
        continue

    if (isList):
        fresh.append([int(line.split('-')[0]), int(line.split('-')[1])])

    if (not isList):
        for f in fresh:
            if (int(line) >= f[0] and int(line) <= f[1]):
                c += 1
                break

print(c)