#!/usr/bin/python
import itertools

def make_range(x):
    x = eval(x)
    if type(x) != type(()): # tuple
        x = x,x
    return xrange(x[0], x[1] + 1)

formula = raw_input()
inp = raw_input()
if not inp.split():
    print eval(formula)
    exit()

dic = {key:make_range(val) for key, val in map(lambda s: s.split("="), inp.split(" "))}
import math
math_map ={ i:j for i,j in zip(dir(math), map(lambda name: eval("math."+name), dir(math)))}
print max(eval(formula, dict(math_map.items() + { k:j for k,j in zip(dic.keys(), i)}.items())) for i in itertools.product(*dic.values()) )