import sys
sys.setrecursionlimit(10**7)
N=int(input())

mod=10**9+7
"""
from functools import lru_cache
@lru_cache(maxsize=None)
def calc(x,y):
    if x==y==0:
        return 1

    ANS=0

    if x>0:
        ANS+=x*calc(x-1,y+1)
    if y>0:
        ANS+=y*calc(x,y-1)

    return ANS%mod


for i in range(1,10):
    print(calc(i,0))
"""
# https://oeis.org/A000680


        
ANS=1
for i in range(1,2*N+1):
    ANS=ANS*i%mod

ANS=ANS*pow(pow(2,N,mod),mod-2,mod)%mod

print(ANS)