ex1.bash : res=5966506063747
	time: 0:00.56 real, 0.56 user, 0.00 sys
	context-switch:	4+1, page-faults: 0+224

ex2.bash res=1714 
	time: 0:02.14 real, 2.05 user, 0.02 sys
	context-switch:	1146+1, page-faults: 0+605