program ZAD1_2;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var x,y,z,c :integer;
begin
  writeln('vvedit znachena x,y,z');
  readln(x,y,z);
 c:=(120-(x+y+z))div 5;
 writeln('c= ',c);
  READLN;
  end.