num1=float(input('enter your first number:'))
op=input('enter an operator:')
num2=float(input('enter your second number:'))

if op == '+':
    print(num1+num2)
elif op == '-':
    print(num1-num2)    
elif op == '*' or op == 'x':
    print(num1*num2)    
elif op == '/':
    print(num1/num2)   
    