n = gets.chomp
n << "E"
a = []
c =""
ans = 0
n.each_char do |i|
  if i =~ /\d/
    c << i
  elsif i =~  /[+*]/
    a << c.to_i
    c = ""
    a << i
  elsif i == "E"
      a << c.to_i
  end
end
ans = a[0]
a = a.drop(1)
a.size.times do |i|
  if a[i] == "*"
    ans += a[i+1]
  elsif a[i] == "+"
    ans *= a[i+1]
  end
end