N=int(input())
mod=10**9+7
dp=[[0 for i in range(10)]for j in range(N)]
for i in range(10):
    dp[0][i]=1
    
for i in range(1,N):
    for j in range(10):
        for k in range(10):
            if j>=k:
                dp[i][j]+=dp[i-1][k]
                dp[i][j]%=mod
ans=0
for i in range(10):
    ans+=dp[-1][i]
print(ans%mod)
#print(dp)