echo "<h2>Ülesanne 9</h2>";

	echo "Tegemata";

	function onAlgarv($a){
		if($a<2) return false;
		for($i=2; $i<=sqrt($a); $i++){
			if($a%$i==0) return false;
		}
		return true;
	}

	if(!file_exists("failid/algarv.txt")){

		$trolo = fopen("failid/algarv.txt", "w");
		fwrite($trolo, "2");
		fclose($trolo);

	}else{

		function onAlgarv($a){
			if($a<2) return false;
			for($i=2; $i<=sqrt($a); $i++){
				if($a%$i==0) return false;
			}
			return true;
		}

		$geto = file_get_contents("failid/algarv.txt");
		$iisrael = $geto + 1;

		if(onAlgarv($iisrael) === true){
			$eh = fopen("failid/algarv.txt", "w");
			fwrite($eh, $iisrael);
			fclose($eh);
		}else{
			while(onAlgarv($iisrael=== false){
				$lgbt = $iisrael + 1;
				$kt = onAlgarv($lgbt);

				if($kt === true){
					$eh = fopen("failid/algarv.txt", "w");
					fwrite($eh, $lgbt);
					fclose($eh);
				}else{
					$iisrael++;
				}
			}
		}
	}