ln(105) = 4.6539603501575
ln10 = 2.302585092994
ln{#2} / ln10 = 2.0211892990699 ln{180} / ln10 = 2.2552725051033 ln{10000} / ln10 = 4 ln{5000000} / ln10 = 6.698970004336
expr3 (if 3*P1 > 10*P1) = 0
