import sequtils,strutils

var
    a : int64
    b : int64
    N = stdin.readline.parseInt

for i in 1..N:
    var s = stdin.readline
    var t : int64
    var u : int64
    var s2 : string = ""
    var p : int64 = 1
    for j,k in s:
        if k == '-':
            p *= -1
            continue
        if k == '.':
            s2 = s[(j + 1) .. s.high]
            break
        t *= 10
        t += ord(k) - ord('0')
    for j in 0..9:
        if s2.high < j:
            u *= 10
        else:
            u *= 10
            u += ord(s2[j]) - ord('0')
    a += t * p
    b += u * p
    

if b >= 1_000_000_000_0:
    a += b div 1_000_000_000_0
    b = b mod 1_000_000_000_0
if b < 0 and a > 0:
    b += 1_000_000_000_00
    a -= 1
elif b < 0 and a < 0:
    b *= -1
elif b < 0 and a == 0:
    b *= -1
    var bs = $b
    while bs.len < 10:
        bs &= '0'
    echo "-0.",bs
    quit()
    
var bs = $b
while bs.len < 10:
    bs &= '0'
echo a,".",bs