n=int(input())
if n==1:
    print(10)
else:
    s=[1]*9
    c=10
    for i in range(1,n):
        for t in range(0,9):
            s[t]=sum(s[t:9])
        c+=sum(s)
    else:
        if c>=10**9+7:
            print(c%(10**9+7))
        else:
            print(c)