Could you please tell me what’s wrong this javascript code

This code is supposed to calculate the sum, substract, multiply, divide at the same time when the user types in x and y but it’s showing Nan

function perform(x, y) {
  x = prompt("enter first no. ")
  y = prompt(" enter second no. ")

  function sum(x, y) {
    console.log(parseInt(x + y));
  }

  sum();

  function minus(x, y) {
    console.log(parseInt(x - y));
  }

  minus();

  function multiply(x, y) {
    console.log(parseInt(x * y));
  }

  multiply();
  
  function divide(x, y) {
    console.log(parseInt(x / y));
  }

  divide();
}