One part I confused are and .

• stands for the pile size
• stands for the number of piles of size you create from the stones

From your case

377083280820 10
1 377083280820 2 188541640410 3 125694426940 4 94270820205 5 75416656164

piles       x stones/pile
1           x377083280820 => 5           x75416656164  1 move
5           x75416656164  => 94270820205 x4            5 moves
94270820205 x4            => 188541640410x2            94270820205 moves
188541640410x2            => 377083280820x1            188541640410 moves

1+5+94270820205+188541640410=282812460621