from fractions import Fraction
N = int(input())

if(N <= 1):
    print([4,3][N])
else:
    n,p = 3,4
    for i in range(N-1):
        next = (Fraction(19 * n) - Fraction(12 * p)) / 4
        n,p = next,n
    a,b = n.as_integer_ratio()
    print(a/b)