Find the mode from the given data.
1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2 , 3, 4, 1, 2, 3, 4, 1 ,2 , 3, 4, 5, 5, 1, 5, 5, 5, 3, 5, 1, 2, 4, 5, 6, 1, 2, 4, 2, 1
If a1+2a2+3a3=1, where a1,a2&a3 are all positive numbers; then what is the minimum value of 2a1+4a2+8a3?