#!/usr/bin/env python

import re
from functools import reduce

FS = {}
POS = [] # empty dict is /

def dig(d, keys):
    if keys == []:
        return d
    else:
        return reduce(dict.__getitem__, keys, d)

def process_instruction(spec):
    _, cmd, *args = spec.split(" ")
    if cmd == "cd":
        if args[0] == "/":
            POS.clear()
        elif args[0] == "..":
            POS.pop()
        else:
            POS.append(args[0])
    elif cmd != "ls": # nothing to do for ls
        raise "Unknown command: " + spec

def process_output(spec):
    cwd = dig(FS, POS)
    size_or_dir, name = spec.split(" ")

    if size_or_dir == "dir":
        cwd[name] = {}
    else:
        cwd[name] = int(size_or_dir)

with open('input') as f:
    # Read the diagram + separating line
    for line in f:
        if line[0] == '$':
            process_instruction(line.rstrip())
        else:
            process_output(line.rstrip())

SIZE = []
# Recursively sum each dictionary and add the sums together
def sum_sizes(d):
    sz = 0

    for v in d.values():
        if isinstance(v, dict):
          sz = sz + sum_sizes(v)
        else:
          sz = sz + v

    if sz <= 100000:
        SIZE.append(sz)

    return sz

sum_sizes(FS)
print(sum(SIZE))