def mult(a,b):
    return a*b

def add(a,b):
    return a+b

with open(r'day6/input.txt', 'r') as input:
    lines = list(map(lambda x: x.split(), input.read().split('\n')[:-1]))

sum = 0

for i in range(len(lines[0])):
    op = add if lines[-1][i] == '+' else mult
    res = int(lines[0][i])
    for j in range(1,len(lines)-1):
        res = op(res,int(lines[j][i]))
    sum += res
        
print(sum)