MOD = 10**9 + 7
n = int(input())
ans = 10
dp = [[0] * 10 for _ in range(n + 1)]
dp[1] = [1]*10
for i in range(2,n + 1):
    for j in range(10):
        if i == 2:
            for k in range(1,j + 1):
                dp[i][j] += dp[i - 1][k]
                dp[i][j] %= MOD
            ans += dp[i][j]
            ans %= MOD
        else:
            for k in range(j + 1):
                dp[i][j] += dp[i - 1][k]
                dp[i][j] %= MOD
            ans += dp[i][j]
            ans %= MOD
print(ans)