SAMPLE INPUT DATA:
Array size n: 12
Corresponding values of arrays y, x_{1} and x_{2} (you can cut and paste sample arrays into form).
y: 89,75,57,34,101,121,68,79,25,59,96,12
x_{1}: 3245,2567,2783,1234,5345,5329,3002,2976,1034,2984,3892,534
x_{2}: 0.008,0.011,0.009,0.015,0.006,0.007,0.008,0.010,0.018,0.010,0.007,0.020
