# Original solution
# -*- coding: utf-8 -*-
import bisect
import heapq
import math
import random
import sys
from collections import Counter, defaultdict, deque
from decimal import ROUND_CEILING, ROUND_HALF_UP, Decimal
from functools import lru_cache, reduce
from itertools import combinations, combinations_with_replacement, product, permutations
from operator import add, mul, sub

sys.setrecursionlimit(100000)


def read_int():
    return int(input())


def read_int_n():
    return list(map(int, input().split()))


def read_float():
    return float(input())


def read_float_n():
    return list(map(float, input().split()))


def read_str():
    return input().strip()


def read_str_n():
    return list(map(str, input().split()))


def error_print(*args):
    print(*args, file=sys.stderr)


def mt(f):
    import time

    def wrap(*args, **kwargs):
        s = time.time()
        ret = f(*args, **kwargs)
        e = time.time()

        error_print(e - s, 'sec')
        return ret

    return wrap

class Mod:
    def __init__(self, m):
        self.m = m
    
    def add(self, a, b):
        return (a + b ) % self.m

    def sub(self, a, b):
        return (a - b) % self.m
    
    def mul(self, a, b):
        return ((a % self.m) * (b % self.m)) % self.m

    def div(self, a, b):
        return self.mul(a, self.pow(b, self.m-2))

    def pow(self, x, y):
        if y == 0: 
            return 1
        elif y == 1: 
            return x % self.m
        elif y % 2 == 0: 
            return self.pow(x, y//2)**2 % self.m
        else: 
            return self.pow(x, y//2)**2 * x % self.m


@mt
def slv(N):
    if N==3:
        return 61

    m = Mod(10**9+7)
    dp = {}
    iv = [
        'agc',
        'acg',
        'gac',
        'aggc'
        'acgc',
        'atgc',
        'agac',
        'aggc',
        'agtc',
    ]
    for s in product('agct', repeat=4):
        s = ''.join(s)
        if not any(map(lambda x: x in s, iv)):
            dp[s] = 1

    for _ in range(N-4):
        dp_ = Counter()
        for k, v in dp.items():
            for c in 'agct':
                s = k + c
                if not any(map(lambda x: x in s, iv)):
                    dp_[s[1:]] = m.add(v, dp_[s[1:]])
        dp = dp_
    
    ans = 0
    for k, v in dp.items():
        ans = m.add(ans, v)


    return ans


def main():
    N = read_int()
    print(slv(N))


if __name__ == '__main__':
    main()


# Optimized solution
# -*- coding: utf-8 -*-
import bisect
import heapq
import math
import random
import sys
from collections import Counter, defaultdict, deque
from decimal import ROUND_CEILING, ROUND_HALF_UP, Decimal
from functools import lru_cache, reduce
from itertools import combinations, combinations_with_replacement, product, permutations
from operator import add, mul, sub

sys.setrecursionlimit(100000)


def read_int():
    return int(input())


def read_int_n():
    return list(map(int, input().split()))


def read_float():
    return float(input())


def read_float_n():
    return list(map(float, input().split()))


def read_str():
    return input().strip()


def read_str_n():
    return list(map(str, input().split()))


def error_print(*args):
    print(*args, file=sys.stderr)


def mt(f):
    import time

    def wrap(*args, **kwargs):
        s = time.time()
        ret = f(*args, **kwargs)
        e = time.time()

        error_print(e - s, 'sec')
        return ret

    return wrap

class Mod:
    def __init__(self, m):
        self.m = m
    
    def add(self, a, b):
        return (a + b ) % self.m

    def sub(self, a, b):
        return (a - b) % self.m
    
    def mul(self, a, b):
        return ((a % self.m) * (b % self.m)) % self.m

    def div(self, a, b):
        return self.mul(a, self.pow(b, self.m-2))

    def pow(self, x, y):
        if y == 0: 
            return 1
        elif y == 1: 
            return x % self.m
        elif y % 2 == 0: 
            return self.pow(x, y//2)**2 % self.m
        else: 
            return self.pow(x, y//2)**2 * x % self.m


@mt
def slv(N):
    if N==3:
        return 61

    m = Mod(10**9+7)
    dp = {}
    iv = [
        'agc',
        'acg',
        'gac',
        'aggc'
        'acgc',
        'atgc',
        'agac',
        'aggc',
        'agtc',
    ]
    for s in product('agct', repeat=4):
        s = ''.join(s)
        if not any(map(lambda x: x in s, iv)):
            dp[s] = 1

    for _ in range(N-4):
        dp_ = Counter()
        for k, v in dp.items():
            for c in 'agct':
                s = k + c
                s = s[1:]
                if s in dp:
                    dp_[s] = m.add(v, dp_[s])
        dp = dp_
    
    ans = 0
    for k, v in dp.items():
        ans = m.add(ans, v)


    return ans


def main():
    N = read_int()
    print(slv(N))


if __name__ == '__main__':
    main()