func main()
	var N: int :: cui@input().toInt(&)
	var sum: int
	for(1, N)
		var _: [][]char :: cui@input().split(".")
		var isNegative: bool :: _[0][0] = '-'
		if(^_ = 2)
			do sum :+ _[0].toInt(&) * 10 ^ 10
			for i(0, ^_[1] - 1)
				do sum :+ (isNegative ?(-1, 1)) * (_[1][i] $ int - '0' $ int) * 10 ^ (9 - i)
			end for
		else
			do sum :+ _[0].toInt(&) * 10 ^ 10
		end if
	end for
	var a: int :: sum.abs() / 10 ^ 10
	var b: int :: sum.abs() % 10 ^ 10
	do cui@print("\{sum < 0 ?("-", "")}\{a}.\{b.toStrFmt("010d")}\n")
end func