# coding: utf-8
import os

os.system('clear')
print('        四則演算')
print('==========================\n')
x = float(input('実数x = '))
y = float(input('実数y = '))
p = str(input('演算: +  -  *  / // %\n'))
if p == '+' :
	print(x + y)
elif p == '-' :
	print(x - y)
elif p == '*' :
	print(x * y)
elif p == '/' :
	print(x / y)
elif p == '//' :
	print(x // y)
elif p == '%' :
	print(x % y)
else:
	print('入力ミス')