ex1.bash : res=650217205854
	time: 0:01.76 real, 1.74 user, 0.01 sys
	context-switch:	5+1, page-faults: 0+188

ex2.bash : res=20394514442037
	time: 0:01.54 real, 1.53 user, 0.01 sys
	context-switch:	42+1, page-faults: 0+196