<<<<<<< HEAD
<<<<<<< HEAD
A=input("Number");
up=1
down=1;
for i in range(2,A+1):
	up=up*(i+A);
	down=down*i;
=======
=======
>>>>>>> 5d151628b32a2ef5b633f055e6961a6c0d18654b
A=input("Number");
up=1
down=1;
for i in range(2,A+1):
	up=up*(i+A);
	down=down*i;
<<<<<<< HEAD
>>>>>>> 5d151628b32a2ef5b633f055e6961a6c0d18654b
=======
>>>>>>> 5d151628b32a2ef5b633f055e6961a6c0d18654b
print(up/down);