input_array result ind for el in input_array if ind result append el e

input_array = [2, 7, 3, 4, 5]

result = []
ind = 0

for el in input_array:
    if ind % 2 == 0:
        result.append(el*2)
    else:
        result.append(el*3)
    ind += 1

print(result)