Problem:
Score : 100 points

Problem Statement

It is known that the area of a regular dodecagon inscribed in a circle of radius a is 3a^2.

Given an integer r, find the area of a regular dodecagon inscribed in a circle of radius r.

Constraints

1 \leq r \leq 100

r is an integer.

Input

Input is given from Standard Input in the following format:

r

Output

Print an integer representing the area of the regular dodecagon.

Sample Input 1

4

Sample Output 1

48

The area of the regular dodecagon is 3 \times 4^2 = 48.

Sample Input 2

15

Sample Output 2

675

Sample Input 3

80

Sample Output 3

19200

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

N = int(input())
A=list(map(int, input().split()))

def sol(i,want):
    num=int(N/(i+1))
    wa=-A[0]
    for j in range(num):
        wa+=A[i+j*i]
    wa=wa%2
    if wa==want:
        x=0
    else:
        x=1
#     print(num)
    return x 

B=A[:]
half=int(N/2)
for i in range(half):
    j=half-1-i
#     print(j)
    B[j]=sol(j,A[j])
    
C=[]
for i in range(N):
    if B[i]==1:
        C.append(i+1)
m=sum(B)
print(m)
print(*C)