Form a number system with only 3 and 4. Find the nth number of the number system Eg.) The numbers are: 3, 4, 33, 34, 43, 44, 333, 334, 343, 344, 433, 434, 443, 444, 3333, 3334, 3343,3344, 3433, 3434, 3443, 3444. Input Format A single number 'n' Constraints 1 <= N <= 100000 Output Format nth number of series