BEGIN { LIMIT=100*1000 }
$2 == "ls" || $1 == "dir" { next}
$2 == "cd" && $3 == ".." {
	if (S[depth]<=LIMIT) {
		R+=S[depth]
	}
	S[depth]=0
	depth -= 1
}
$2 == "cd" && $3 != ".." { depth += 1; P[depth]=$3; }
NF == 2 {
	for (i=1;i<=depth;i++) {
		S[i]+=$1
	}
}
END { print R }