func main()
	var s: []char :: cui@input()
	var lastOp: char :: '*'
	var num: int :: 0
	var ans: int :: 0
	for i(0, ^s - 1)
		if(s[i] = '*' | s[i] = '+')
			if(lastOp = '*')
				do ans :+ num
			else
				do ans :* num
			end if
			do lastOp :: s[i]
			do num :: 0
		else
			do num :* 10
			do num :+ [s[i]].toInt(&)
		end if
	end for
	if(lastOp = '*')
		do ans :+ num
	else
		do ans :* num
	end if
	do cui@print("\{ans}\n")
end func