import numpy as np

LINES_NUM = 5

count = 0

probs = np.array([])

with open('input.txt', 'r') as file:
    cols_num = len(file.readline()[:-1])
    file.seek(0)
    for line in file:
        line = line[:-1]
        for char in line:
            probs = np.append(probs, char)

    probs = probs.reshape((LINES_NUM, cols_num))

    nums = []
    skip_col = False
    for col in probs.T[::-1]:

        if skip_col:
            skip_col = False
            continue

        nums.append(int(col[0].strip() + col[1].strip() + col[2].strip() + col[3].strip()))

        if col[4] == '+':
            print("Adding:", nums)
            count += sum(nums)
            nums = []
            skip_col = True
        elif col[4] == '*':
            print("Multiplying:", nums)
            prod = 1
            for n in nums:
                prod *= n
            count += prod        
            nums = []
            skip_col = True
print(count)