Uses Crt;
var a, b, c: integer;
Sab, Sac, Sbc: integer;
begin
ClrScr;
Write (' a = '); ReadLn(a);
Write (' b = '); ReadLn(b);
Write (' c = '); ReadLn(c);
Sab:=a+b;
Sac:=a+c;
Sbc:=b+c;
if (Sab>0) or (Sac>0) or (Sbc>0)
then WriteLn ( ' Да !')
else WriteLn ( ' Нет ...');
ReadLn;
end.