function toh(N, fromm, to, aux) {
    let count = 0;

    function helper(N, fromm, to, aux) {
        if (N === 1) {
            count += 1;
            console.log("move disk " + N + " from rod " + fromm + " to rod " + to);
            return;
        }
        helper(N - 1, fromm, aux, to);
        count += 1;
        console.log("move disk " + N + " from rod " + fromm + " to rod " + to);
        helper(N - 1, aux, to, fromm);
    }

    helper(N, fromm, to, aux);
    return count;
}