-------------- pseudo-random: -------------
N	= 10000
result	= 1.37898
exact	= 1.3932
estimated error	= 0.0615297
actual error	= 0.0142262
-------------- quasi-random: -------------
N	= 100000
result	= 1.3934
exact	= 1.3932
estimated error	= 0.00279396
actual error	= 0.000198557