mod = 1000000007
n = int(input())
v = [[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]] + [[0] * 10 for _ in range(n)]
def solve():
    for i in range(1, n + 1):
        v[i][0] = 1
        for j in range(1, 10):
            v[i][j] = (v[i - 1][j] + v[i][j - 1]) % mod
    return v[n][9]
print(solve())