s = input() + '*'

res = 0
num = 0
ns = ''
op = '*'
for c in s:
    if c == '*' or c == '+':
        if op == '*':
            res += num
        elif op == '+':
            res *= num
        ns = ''
        op = c
    else:
        ns += c
        num = int(ns)
print(res)