N=int(input())
if N==1:
    print(10)
    exit()
else:
    ans=10
    dp=[[0 for i in range(10)] for j in range(N+1)]
    #dp[K][i]   = K桁めまで見て末尾がi以下のもの
    mod =10**9 + 7
    for i in range(10):
        if i==0:
            dp[2][i]=i
        else:
            dp[2][i]=i+dp[2][i-1]
    for i in range(3,N+1):
        for j in range(1,10):
            dp[i][j]=(dp[i][j-1]+dp[i-1][j])%mod
    for i in range(2,N+1):
        ans+=dp[i][9]
        ans%=mod
    print(ans)