program Project2;
{$APPTYPE CONSOLE}
uses
  SysUtils;

var inp,outp: textfile;
    n: array[1..3] of integer;
    s: string;
    a: integer;
begin
   assignfile(inp,'Task1.in');
   assignfile(outp,'Task1.out');
   reset(inp);
   rewrite(outp);
   readln(inp,s);
   n[1]:=StrToInt(copy(s,1,1));
   n[2]:=StrToInt(copy(s,3,1));
   n[3]:=StrToInt(copy(s,5,1));
   a:=0;
   if copy(s,2,1)='+' then
      a:=n[1]+n[2]
   else if copy(s,2,1)='-' then
      a:=n[1]-n[2]
   else a:=n[1]*n[2];
   if copy(s,4,1)='+' then
      a:=a+n[3]
   else if copy(s,4,1)='-'then
      a:=a-n[3]
   else a:=a*n[3];
   writeln(outp,a);

   closefile(inp);
   closefile(outp);
end.