a=float(input("#1",))
b=float(input("#2",))
res=None
oper=input("oper")
if oper=="+":
  print(a+b)
elif oper=="-":
  print(a-b)
elif oper=="*":
   print(a*b)
elif oper=="/":
  print(a/b)
elif oper=="**":
  print(a**b)
elif oper=="kore":
  import math
  math.sqrt(a)
  sqrt (print(a**1/2))
  print(pow(b,k))
  oper=input("oper")
else:
  print("unit")
if res is not None:
  print("res",res)