\[\boxed{\text{813\ (813).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[f(3,7) = \lbrack 3,7\rbrack = 3\ \]
\[f(0) = \lbrack 0\rbrack = 0\]
\[f(0,64) = \lbrack 0,64\rbrack = 0\]
\[f( - 0,35) = \lbrack - 0,35\rbrack = - 1\]
\[f(2) = \lbrack 2\rbrack = 2\ \]
\[f( - 2,8) = \lbrack - 2,8\rbrack = - 3\]