n = input("")
fac_2n = 1
fac_n = 1
for i in range(1,int(2*n)+1):
	fac_2n = fac_2n*i
for i in range(1,int(n)+1):
	fac_n = fac_n*i;
ans = int(fac_2n/fac_n*fac_n*(n+1))
print(ans)