// cell[21] = 2^cell[20] // hint: use left shift

loadc 0   // reg[0] = 0x14
14
loadc 1   // reg[1] = 1
1
load 2 0  // reg[2] = cell[0x14] = # interations to do
loadc 3   // reg[3] = result = 1
1
loadc 4   // reg[4] = goto target = 9
9

// instruction #9:
lshift 3 3 // reg[3] = 2 * reg[3]
sub 2 1  // reg[2] = reg[2] - 1
if 2 4   // if reg[2] > 0 goto 9
// store result
add 0 1  // reg[0] = 0x15
store 0 3  // cell[0x15] = reg[3]
halt
0
0
0
0
0
5
0