input = open('input.txt', 'r').read().splitlines()

ranges = []
food = []
answer = 0

for line in input:
    if '-' in line:
        ranges.append(list(map(int, line.split('-'))))
    elif line != '':
        food.append(int(line))

for item in food:
    for range in ranges:
        if range[0] <= item <= range[1]:
            answer += 1
            break

print(answer)