$n = trim(fgets(STDIN));

$answer = "";
$keta = 0;

if($n%2 == 0) {
    $keta = $n/2;
    for($i=1; $i<=$keta; $i++) {
        $answer = "1".$answer;
    }
}else {
    $keta_floor = floor($n/2);  // 切り下げ
    for($i=1; $i<$keta_floor; $i++) {
        $answer = "1".$answer;
    }
    $answer = "7".$answer;
}

echo $answer."\n";