import sequtils,strutils
var
    ans : int
    S = stdin.readline
    m : string
    flag = false
m = ""
S &= '*'
for s in S:
    if s == '*' or s == '+':
        if flag:
            ans *= m.parseInt
        else:
            ans += m.parseInt
        if s == '*':
            flag = false
        else:
            flag = true
        m = ""
    else:
        m &= s
echo ans