#!/usr/bin/python 
#-*-coding:utf-8 -*-
 
name = raw_input("Please input your name here : ")
if name == '':
 print "we don't like anonymous"
else:
 choose = input("Which shape would you like to choose 1:Rectangle, 2:Square, 3:Triangle or 4 Round")
 if choose == 1:
 width, height = map(int, raw_input("Input width and height here, like 5 8 :").split())
 print "Area = %d" % (width * height)
 elif choose == 2:
 length = input("Input width and height here, like 4:")
 print "Area = %d" % length ** 2
 elif choose == 3:
 width, height = map(int, raw_input("Input width and height here, like 5 8 :").split())
 print "Area = %d" % (width * height / 2)
 elif choose == 4:
 diameter = input("Input diameter here like 3 :")
 print "Area = %.2f" % (3.14 * (diameter / 2) ** 2)
 else:
 print "Invalid choose"