My
[1] gives correct answers:
tax[7] = tax[3] * tax[4] * tax[5] * tax[6] = 3 * 4 * 8 * 16 = 1536
tax[8] = 4*8*16*1536 = 786,432
tax[9] = 8 * 16 * 1536 * 786,432 = 18811834
tax[10] = 16 * 1536 * 786,432 * 18,811,834 = 84,208,956
tax[11] = 1536 * 786432 * 18811834 * 84208956 = 35889352
tax[12] = 786432 * 18811834 * 84208956 * 35889352 = 75453662
tax[13] = 18811834 * 84208956 * 35889352 * 75453662 = 44609468
But still I am getting Wrong Answer :(
([ideone link][2].)
[1]: http://www.codechef.com/viewsolution/1959063
[2]: http://ideone.com/scwT0S