In ancient times, there was a wise minister in a kingdom. He invented chess and presented it to the king. Since then, the king has been fascinated by chess. In order to express his gratitude to the wise minister, the king promised to meet a request of the minister. The minister said, "Just put some rice grains on this chessboard. Put 1 grain of rice in 1 grid, 2 grains of rice in the second grid, 4 grains of rice in the third grid, then 8 grains, 16 grains, 32 grains, ... until the 64th grid. " "You are so stupid! Just a little rice? ! "The king smiled. The minister said, "I'm afraid there isn't that much rice in your treasury!" " "After is equal to:

2^0+2^ 1+2^2+……+2^63

=2^64- 1

=1844674073709551615 capsules are about 2200 tons.