gets
x=y=0
readlines.map{|s|
  a=s.chomp.split('.')
  x += a[0].to_i
  y += (s[0]=='-' ? -1 : 1) * ((a[1]==nil ? '' : a[1]) + "0000000000000000000")[0..9].to_i
}
M=10000000000
while y < 0
  y += M
  x -= 1
end
x += y/M
y %= M

if x >= 0 or y == 0
  puts sprintf("%d.%010d",x,y)
else
  puts sprintf("%d.%010d",x+1,M-y)
end