#!/usr/bin/env python3

import sys

position = 50
code = 0

for line in sys.stdin:
    line = line.strip()
    if line.startswith('L'):
        position -= int(line[1:])
    elif line.startswith('R'):
        position += int(line[1:])
    else:
        raise Exception('weird line')

    position %= 100

    if not position:
        code += 1

print(code)