a = float(input("operande1 : "))
op = input("operateur (+, -, *, /) : ")
b = float(input("operande2 : "))
res = 0
if (op == '+'):
    res = a + b
elif (op == '-'):
    res = a - b
elif (op == '*'):
    res = a * b
elif (op == '/'):
    res = a / b
print(a, op, b, "=", res)