import sys
from collections import defaultdict

# sys.setrecursionlimit(6500)

with open('input.txt', 'r') as f:
    numbers = [int(x) for x in f.read().split()]

# print(numbers)

class Node:
    def __init__(self, header):
        self.header = header
        self.children = []
        self.meta = []

    def add_child(self, child):
        self.children.append(child)
    
    def add_meta(self, data):
        self.meta.append(data)

    def meta_sum(self):
        return sum([x.meta_sum() for x in self.children]) + sum(self.meta)

def get_node(i):
    num_childs = numbers[i]
    num_meta = numbers[i + 1]
    header = (num_childs, num_meta)

    node = Node(header)
    size = 2
    for _ in range(num_childs):
        child, ch_size = get_node(i + size)
        node.add_child(child)
        size += ch_size

    for _ in range(num_meta):
        node.add_meta(numbers[i + size])
        size += 1

    return node, size 

# print(len(numbers))
root = get_node(0)[0]

print(root.meta_sum())