N = int(input())
dp = [[0] * 10 for _ in range(N)]
P = 10 ** 9 + 7

for i in range(10):
    dp[0][i] = 1
for i in range(N-1):
    for j in range(10):
        for k in range(j,10):
            dp[i+1][k] = (dp[i+1][k] + dp[i][j]) % P
print(sum(dp[-1])%P)