Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
Grant has four times as many vacations as Kelvin has classes. If Kelvin has 90 classes, how many vacations and classes do Grant and Kelvin have altogether?

### Response:
 แกรนท์มีวันหยุดพักผ่อน 4 * 90 = <<4*90=360>>360 วัน
รวมกันทั้งหมด พวกเขามี 360 + 90 = <<360+90=450>>450 วันหยุดพักผ่อนและคลาส