program fibo;
	function fib (cislo : integer):longint;
		begin
			if cislo = 0 then fib := 0
			else if cislo = 1 then fib := 1
			else fib := fib ( cislo - 1 ) + fib( cislo - 2 );
		end;

begin
	writeln( fib( 500 ) );
end.