#AscNumber
#https://yukicoder.me/problems/no/741

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