n=int(input())
M=1000000007
a=1
for i in range(n*2):
  a*=i+1
  a%=M
i2=pow(2,M-2,M)
for i in range(n):
  a*=i2
  a%=M
for i in range(n):
  a*=i+1
  a%=M
print(a)