N = int(input())
res = 10
mod = 10**9+7
dp = [[0]*10 for _ in range(N)]
for i in range(10):
    dp[0][i] = 1
for i in range(1, N):
    sm = 0
    for j in range(1,10):
        sm += dp[i-1][j]
        dp[i][j] = sm
        res += sm
        res %= mod
print(res)