1. The magic school has three classes: beginner, intermediate, and advanced, with the number of students in each class increasing by the same amount. If the total number of students does not exceed 300, and $30 \%$ of the female students and $25 \%$ of the male students are in the beginner class, $45 \%$ of the female students and $20 \%$ of the male students are in the intermediate class, then the number of male students is $\qquad$ people.
$140$