using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Globalization; using static System.Console; using Pair = System.Collections.Generic.KeyValuePair; class Program { static void Main() { var sw = new StreamWriter(OpenStandardOutput()) { AutoFlush = false }; SetOut(sw); new Program().solve(); Out.Flush(); } Scanner cin = new Scanner(); readonly int[] dd = { 0, 1, 0, -1, 0 }; readonly int mod = 1000000007; readonly string alfa = "abcdefghijklmnopqrstuvwxyz"; void solve() { int n = cin.nextint; long lsum = 0; long dsum = 0; for (int i = 0; i < n; i++) { string s = cin.next; int j = 0; bool flag = true; if(s[j] == '-') { j = 1; flag = false; } long l = 0; while (j < s.Length && s[j] != '.') { l *= 10; l += int.Parse(s[j].ToString()); j++; } if (flag) { lsum += l; } else { lsum -= l; } long d = 0; for (int k = 1; k <= 10; k++) { d *= 10; if (j + k >= s.Length) continue; d += int.Parse(s[j + k].ToString()); } if (flag) { dsum += d; } else { dsum -= d; } } lsum += dsum / (long)Math.Pow(10, 10); var mod = Math.Abs(dsum % (long)Math.Pow(10, 10)); Write(lsum + "."); if (mod == 0) { WriteLine("0000000000"); } else { WriteLine(mod); } } } class Scanner { string[] s; int i; char[] cs = new char[] { ' ' }; public Scanner() { s = new string[0]; i = 0; } public string[] scan { get { return ReadLine().Split(); } } public int[] scanint { get { return Array.ConvertAll(scan, int.Parse); } } public long[] scanlong { get { return Array.ConvertAll(scan, long.Parse); } } public double[] scandouble { get { return Array.ConvertAll(scan, double.Parse); } } public string next { get { if (i < s.Length) return s[i++]; string st = ReadLine(); while (st == "") st = ReadLine(); s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries); i = 0; return next; } } public int nextint { get { return int.Parse(next); } } public long nextlong { get { return long.Parse(next); } } public double nextdouble { get { return double.Parse(next); } } }