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

pos = 50
password = 0

for line in input:
    if line.startswith('L'):
        pos -= int(line[1:])
    elif line.startswith('R'):
        pos += int(line[1:])

    if pos < 0:
        pos += 100
    elif pos > 99:
        pos -= 100

    if pos == 0:
        password += 1

print(password)