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

pos = 50
password = 0

for line in input:
    if line.startswith('L'):
        for _ in range(int(line[1:])):
            pos -= 1
            if pos == -1:
                pos = 99
            elif pos == 0:
                password += 1
    elif line.startswith('R'):
        for _ in range(int(line[1:])):
            pos += 1
            if pos == 100:
                pos = 0
                password += 1

print(password)