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)