\[c_{1} = 8;\ \ c_{n + 1} = c_{n} - 1\]
\[c_{2} = c_{1} - 1 = 7;\]
\[c_{3} = c_{2} - 1 = 6;\]
\[c_{4} = c_{3} - 1 = 5;\]
\[c_{5} = c_{4} - 1 = 4.\]