^{18} + (2P)_{low} \cdot 10^9$
Term 3 ($P$):
$P_{high} \cdot 10^9 + P_{low} \cdot 10^0$

Let's arrange these block by block (each block is 9 digits):
Block 3 (10^27): $P_{high} = 121932631$
Block 2 (10^18): $P_{low} + (2P)_{high} = 112635269 + 243865262 = 356500531$
Block
