import sequtils,strutils,math

type
    decimal = tuple[i : int64,f : float64]

proc `+` (x,y : decimal) : decimal=
    result.f = x.f + y.f
    result.i = x.i + y.i
    if result.f < 0:
        result.f = round(result.f - 1e-13,13)
    else:
        result.f = round(result.f,12)
    result.i += result.f.int
    result.f -= result.f.int.float64

proc `$` (x : decimal):string =
    var s = ""
    if x.f < 0:
        if x.i < 0:
            s &= $x.i
            var n = formatBiggestFloat(x.f,ffDecimal,10)
            n = n[2..n.high]
            s &= n
        elif x.i == 0:
            s = formatBiggestFloat(x.f,ffDecimal,10)
        else:
            s &= $(x.i - 1)
            var n = formatBiggestFloat(x.f + 1.0,ffDecimal,10)
            n = n[1..n.high]
            s &= n
    if x.f >= 0:
        if x.i == -1:
            s = formatBiggestFloat(x.f,ffDecimal,10)
        if x.i < -1:
            s = $(x.i + 1)
            var n = formatBiggestFloat(x.f - 1.0,ffDecimal,10)
            n = n[2..n.high]
            s &= n
        else:
            s = $x.i
            var n = formatBiggestFloat(x.f,ffDecimal,10)
            n = n[1..n.high]
            s &= n
    return s

proc parseDec(s : string):decimal=
    var i = s.find('.')
    if i == -1:
        result.i = s.parseBiggestInt
    else:
        result.i = s[0..<i].parseBiggestInt
        result.f = ("0" & s[i..s.high]).parsefloat
        if s[0] == '-':
            result.f *= -1
var
    N = stdin.readline.parseInt
    a,ans : decimal
    
for n in 0..<N:
    a = stdin.readline.parseDec
    ans = ans + a

echo ans