#!/usr/bin/env python3
import re

lines = (x.strip() for x in open("input.txt"))

result = 0
nums = [dict(), dict(), dict()]
signals = []
DIGIT = re.compile("\d+")


for idx, line in enumerate(lines):
    next_num_items = [(idx, match.start(), match.end(), int(line[match.start():match.end()])) for match in DIGIT.finditer(line)]
    next_num_items = {i: val for val in next_num_items for i in range(val[1], val[2])}
    next_char_idxs = [j for j, char in enumerate(line) if char in "*"]
    nums = nums[1:] + [next_num_items]

    # check
    for signal in signals:
        found = set()
        for i in range(signal-1, signal+2):
            for j in range(0, 3):
                if i in nums[j]:
                    found.add(nums[j][i])
        if len(found) == 2:
            result += found.pop()[3] * found.pop()[3]

    signals = next_char_idxs

print(result)