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

# dp[i][j] := i桁目まで確定時，桁の末尾がjのもの
dp = [[0 for _ in range(10)] for _ in range(n + 1)]
dp[0][0] = 1

for i in range(n):
    for j in range(10):
        for x in range(j, 10):
            dp[i+1][x] += dp[i][j]
            dp[i+1][x] %= MOD

print(sum(dp[-1]) % MOD)