formula = list(input())

result = 0
pre_ope = False # True:+ False:*
pre_num = 0
f = lambda r, n, o: r * n if o else r + n

for c in formula:
    if c == '+':
        result = f(result, pre_num, pre_ope)
        pre_num = 0
        pre_ope = True
    elif c == '*':
        result = f(result, pre_num, pre_ope)
        pre_num = 0
        pre_ope = False
    else:
        pre_num *= 10
        pre_num += int(c)
else:
    result = f(result, pre_num, pre_ope)

print(result)