import fileinput
from functools import reduce
from operator import mul

a = []
op = []
with fileinput.input() as lines:
	for line in lines:
		t = line[:-1].split(' ')
		if t[0] == '+' or t[0] == '*':
			op = [x for x in t if x != '']
		else:
			a.append([int(x) for x in t if x != ''])

def sol(a, op, i):
	col = [a[j][i] for j in range(len(a))]
	return sum(col) if op[i] == '+' else reduce(mul, col, 1)

print(sum(sol(a, op, i) for i in range(len(a[0]))))