Problem:
Score : 100 points

Problem Statement

Takahashi is going to set a 3-character password.

How many possible passwords are there if each of its characters must be a digit between 1 and N (inclusive)?

Constraints

1 \leq N \leq 9

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the number of possible passwords.

Sample Input 1

2

Sample Output 1

8

There are eight possible passwords: 111, 112, 121, 122, 211, 212, 221, and 222.

Sample Input 2

1

Sample Output 2

1

There is only one possible password if you can only use one kind of character.

Solution in Python (3.4.3) (judge verdict: Runtime Error)

n = int(input())
b = list(map(int,input().split()))
ans = 0

for i in range(n-2):
    ans += min(b[i],b[i+1])  

if n == 2:
    print(min(b)*2)
else:
    print(ans+b[-1]+min(b))