N = int(input())
MOD = 10 ** 9 + 7

dp = [[0] * 10 for _ in range(N + 1)]
for i in range(10):
    dp[1][i] = 1

for i in range(1, N):
    for lst in range(10):
        for nxt in range(lst, 10):
            dp[i + 1][nxt] += dp[i][lst]
            dp[i + 1][nxt] %= MOD

ans = 0
for i in range(10):
    ans += dp[N][i]
    ans %= MOD

print(ans)