# OLD WAY
for i in range(1,4):
    param[i] = amp.ptr + i if amp.lst[amp.ptr]//int('100'.ljust(i+2, '0')) % 10 else amp.lst[amp.ptr + i]

# NEW WAY
if opcode == 3 or opcode == 4:
    param_range = 3
else:
    param_range = 4
for i in range(1,param_range):
    param[i] = amp.ptr + i if amp.lst[amp.ptr]//int('100'.ljust(i+2, '0')) % 10 else amp.lst[amp.ptr + i]