program pr;
var x,y: real;
begin
readln (x);
if x-3<>0 then
y:=(x+5)/(x-3);
writeln(y);
end
else writeln('Решений нет')
end.
program pr;
var x,y: real;
begin
readln (x);
if x-3<>0 then
begin
y:=(x+5)/(x-3);
writeln(y);
end
else writeln('Решений нет')
end.