class Storage {

        constructor (capacity) {

         this.capacity = capacity;

          this.storage = [];

          this.totalCost = 0;

        }


        addProduct (obj) {

          this.storage.push(JSON.stringify(obj));

          this.capacity -= obj.quantity;

          this.totalCost += obj.price * obj.quantity;

         }

          getProducts() {

            return this.storage.join('\n');

         }



      }