N = int(input())
mod = 10 ** 9 + 7
dp = [[0] * 10 for i in range(N + 1)]
dp[0][0] = 1
for i in range(N):
    for j in range(10):
        for k in range(10):
            if k >= j:
                dp[i + 1][k] += dp[i][j] % mod
                dp[i + 1][k] %= mod
ans = 0
for i in range(10):
    ans += dp[N][i]
    ans %= mod
print(ans)