Yash can do a piece of work in 49 days and Naman can do the same work in 35 days. Saurav can do the same work in 7 days. Find the total days required to complete the same work if they work on alternate days such that Yash works on the first day, Naman works on the second day, Saurav work on the third day and then again Yash works on the fourth day and so on.