Prince Remmarguts helped Uyuw successfully hold a concert in our previous story (POJ 2451), and ...that was the day of Uyuw's birthday.
Ting-a-ling, the chef was called on by Remmarguts. "You must prepare an immense birthday cake for lovely Princess Uyuw in a single day," said Remmarguts. Though Remmarguts' order is outrageous, the chef eventually rushed to buy flour, sugar, fat, and some other ingredients.
There had been chaos caused by war for quite a long time. The price of everything has been highly raised. Being the head accountant of country UDF – United Delta of Freedom, you must weight the cake carefully to make sure the chef did not perform a cheat on the ingredients.
The cake is made up of N levels. There is a 'cube' in each level, while the length of cube on k-th level (count from the topmost) is exactly k! For Remmarguts lives in an M-Dimension world unlike our, you should notice that the 'cube' here means M-Dimension cube, and the volume of a cube with length k is k ^ M.
You are to calculate the total volume of such an immense cake.