program masuvu_2;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var
  a:array[1..100] of integer ;
  s,i,n:integer;
begin
  readln(n);
  for i:=1 to n do
  readln(a[i]);
  s:=0;
  for i:=1 to n do
  if a[i]>0 then
  s:=s+a[i];
  writeln('s= ',s);
  readln;
end.