Gift Box Coverage

side_size =  float(input())
sheets = int(input())
sheet_cover = float(input())
covered = 0

box_size = 6 * side_size ** 2

for sheet in range(1, sheets + 1):
    if sheet % 3 == 0:
        covered += sheet_cover * 0.25
    else:
        covered += sheet_cover

print(f'You can cover {((covered / box_size) * 100):.2f}% of the box.')