#979. Stairs: steps 1, 2, 5
A staircase has n steps. Each time you can climb 1, 2, 5 steps. How many ways are there to land exactly on the top?
### Input
One integer n (1 ≤ n ≤ 60).
### Output
A number.
Examples
Input
47
Output
47852534055
Input
58
Output
16927808528602
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.