Mohaima's lifespan is 5 years. If it cannot evolve into a sea thorn dragon within 5 years, it will die of exhaustion. A low-level energy cube costs 3,000 yuan. An elf wants to upgrade from intermediate to high-level, and it costs about 1,000 yuan. An energy cube cost nearly 3 million! Yuning took a crumpled piece of money from the foreman: this is the income of moving bricks today, 100 yuan.