add 28.tibas
add 28.tibas

lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler,lunixbochs/project-euler