let calories =
  prompt("How many calories do you eat for breakfast?", 700) +
  prompt("How many calories do you eat for lunch?", 500) +
  prompt("How many calories do you eat for dinner?", 500);
alert("you eat $`{calories}` for breakfast");

// let calories2 = prompt("How many calories do you eat for lunch?", 500);
// alert("you eat ${calories2} calories for breakfast");
// let calories3 = prompt("How many calories do you eat for dinner?", 500);
// alert("you eat ${calories3} calories for breakfast");
// let result = (${ calories1 } + ${ calories2 } + ${ calories3 });

// alert(result);