N = int(input())
MOD = 10**9+7
dp = [[0 for _ in range(N+1)] for _ in range(10)]

for i in range(1,10):
  dp[i][1] = 1
for i in range(1,10):
  for j in range(2,N+1):
    num = 0
    for k in range(1,i+1):
      num += dp[k][j-1]
      num %= MOD
    dp[i][j] = num

ans = 1
for i in range(10):
  for j in range(N+1):
    ans += dp[i][j]
    ans %= MOD

print(ans)