program qq;
var
x,y,s,x1,x2,y1,e:real;
i,c:integer;
begin
writeln('введите х ');
read(x);
writeln('введите y ');
read(y);
s:=1;
x1:=cos(x);
x2:=sin(x);
y1:=cos(y);
e:=((x1/x2)+(x1-y1));
c:=trunc(e);
for i:= 1 to c do begin
s:=s*(1-tan(x));
end;
writeln(s);
end.