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

dp = [1] * 10
for i in range(1, N):
    pp = [0] * 10
    dp, pp = pp, dp
    for j in range(10):
        for k in range(j, 10):
            dp[k] += pp[j]
            dp[k] %= MOD

ans = sum(dp) % MOD
print(ans)