class Storage {
    constructor(capacity) {
        this.capacity = capacity;
        this.storage = [];
        this.totalCost = 0;
    }

    addProduct(product) {
      this.storage.push(product);
      this.capacity -= product.quantity;
      this.totalCost += product.price * product.quantity;
    }

    getProducts() {
      const result = [];

      this.storage.forEach(product => {
        result.push(JSON.stringify(product));
      });
      return result.join('\n');
    }
}