import sys
try:
    import os
    f = open('input.txt', 'r')
    sys.stdin = f
except FileNotFoundError:
    None
from math import sqrt, ceil
input=lambda: sys.stdin.readline().strip()

def expr():
    global now
    x = num()
    while now<n and s[now] in "*+":
        op=s[now] ;now+=1
        y =num()
        if op =="*":
            x+=y
        else:
            x*=y
    return x

def num():
    global now
    ans=0
    while now<n and s[now].isdecimal():
        ans= ans*10 + int(s[now])
        now+=1
    return ans


s=input()
n=len(s)
now=0
print(expr())