n = int(input())
dp = []
ans = 0
for i in range(n):
    c = [0] * 10
    dp.append(c)
for i in range(10):
    if(i != 0 and i != 8):
        dp[0][i] = 1;
for i in  range(1, n):
    dp[i][0] = dp[i - 1][4] + dp[i - 1][6]
    dp[i][1] = dp[i - 1][6] + dp[i - 1][8]
    dp[i][2] = dp[i - 1][7] + dp[i - 1][9]
    dp[i][3] = dp[i - 1][8] + dp[i - 1][4]
    dp[i][4] = dp[i - 1][9] + dp[i - 1][0] + dp[i - 1][3]
    dp[i][5] = 0
    dp[i][6] = dp[i - 1][7] + dp[i - 1][0] + dp[i - 1][1]
    dp[i][7] = dp[i - 1][2] + dp[i - 1][6]
    dp[i][8] = dp[i - 1][1] + dp[i - 1][3]
    dp[i][9] = dp[i - 1][4] + dp[i - 1][2]
for i in range(10):
    ans += dp[n - 1][i]
print(ans)