n=int(input())
dp=[[0]*10 for i in range(n+2)]
dp[1][0] = 1
mod=10**9+7

for i in range(1,n+2):
    for j in range(1,10):
        dp[i][j] = dp[i-1][j-1] + dp[i-1][j]
        dp[i][j]%=mod
        dp[i-1][j] += dp[i-1][j-1]
        dp[i-1][j]%=mod
    dp[i][0] = 1

print(sum(dp[-1])%mod)