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

dp = [[0]*10 for i in range(n+1)]
dp[0][0] = 1
for i in range(n):
    for j in range(10):
        for k in range(j+1):
            dp[i+1][j] += dp[i][k]
            dp[i+1][j] %= mod

print(sum(dp[n])%mod)