The first line is a number The second line is an operator (+,-,*,/) The last line is a number

Input Format:
The first line is a number The second line is an operator (+,-,*,/) The last line is a number

Output Format:
Output the result of an operation(2 decimal places) If the divisor is zero, the error 'divided by zero' is displayed.

Sample Inputs1:
7
/
3
结尾无空行
Sample Output1:
2.33
结尾无空行
Sample Inputs2:
10
/
0
结尾无空行
Sample Output2:
divided by zero
结尾无空行

x=input()
code=input()
y=input()
if code=='/' and y=='0':
    print('divided by zero')
elif x.isdigit() and y.isdigit():
    print(round(eval(x+code+y),2),end='')

a = input()
b = input()
c = input()

if b == "+":
    print(int(a) + int(c))

if b == "-":
    print(int(a) - int(c))

if b == "*":
    print(int(a) * int(c))

if b == "/":
    if int(c) == 0:
        print('divided by zero')
    else:
        print(round(int(a) / int(c), 2))