r = int(input())
s = 3.1415926 * r * r;
c = 3.1415926 * r * 2;
print('%.2f' % s)
print('%.2f' % c)
/**************************************************************
	Problem: 1005
	User: admin
	Language: Python
	Result: Accepted
	Time:87 ms
	Memory:34244 kb
****************************************************************/