i=int(input())
a=[1]*10
b=a[:]
s=10
for _j in range(i-1):
    c=b[:]
    for i in range(1,10):
        s-=c[i-1]
        b[i]=s
        a[i]+=s
    s=sum(b)  
print(sum(a)%(10**9+7))