#!/usr/bin/python3
import math

def func(x):
	fx=None
	if x<=0:
		fx=3*x**2+1
		print(f"{fx} gia x={x}")
	elif x>0 and x<=3:
		fx=2*x+1
		print(f"{fx} gia x={x}")
def main():
	x=float(input("give me x:")
	func(x)
if __name__=="__main__":
	main()