kjcc01_17066
Chef wants you to write a calculator program for carrying out some simple mathematical operations. Chef calls the program Calculator Plus Plus.


Input

First line contains an operation in the form : a operator b


Output

Output in a single line the result of the mathematical operation. Print "Invalid Operator" if input operator is none of these  +, -, *, /


Constraints

-(10^50)<=a,b<=(10^50)


Example
Input:
10 + 30

Output:
40

Input:
1 % 1

Output:
Invalid Operator


Explanation

In first example, 10 + 30 simply evaluates to 40
In second example, '%' is not a valid opeartor according to our Calculator plus plus program.
A=raw_input().split();	op_1=int(A[0]);	op_2=int(A[2]);
if A[1]=='+':
	print op_1+op_2;
elif A[1]=='-':
	print op_1-op_2;
elif A[1]=='*':
	print op_1*op_2;
elif A[1]=='/':
	print op_1/op_2;
else:
	print 'Invalid Operator';