lines = [[l.split(" ") for l in m.splitlines()] for m in open("input.txt", 'r').read().split("$ ")][1:]

path = ["/"]
sizes = {"/":0}
sum = 0

for l in lines:
    if l[0][0] == "cd":
        if l[0][1] == "/":
            path = ["/"]
        elif l[0][1] == "..":
            path.pop()
        else:
            path.append(l[0][1]+"/")
    elif l[0][0] == "ls":
        for i in range(1,len(l)):
            if l[i][0] == "dir":
                sizes["".join(path) + l[i][1]+"/"] = 0
            else:
                sofar = ""
                for p in path:
                    sofar += p
                    sizes[sofar] += int(l[i][0])

for s in sizes:
    if sizes[s] <= 100000:
        sum += sizes[s]

print(sum)