VAR
x: INTEGER;
BEGIN
WRITE('Enter number of lesson: ');
READLN(x);
IF (x > 15) OR (x < 1)
THEN
WRITELN('Error. 0 < x <= 15')
ELSE
BEGIN
x := 475 + 50 * x;
WRITE('Time: ', x DIV 60, ' ', x MOD 60)
END;
READLN
END.