import strutils
let S = stdin.readLine

var
  ans, num = 0
  ns = ""
  op = '*'

for s in S & " ":
  if s.isDigit:
    ns.safeAdd s
  else:
    num = ns.parseInt
    if op == '*':
      ans += num
    else:
      ans *= num
    ns = ""
    op = s

echo ans