var
i: integer;
pr, sum, a: real;
begin
readln(a);
pr := 1;
sum := 1 / a;
for i := 1 to 10 do
begin
pr := pr * (a + i);
sum := sum + (1 / (a * pr));
end;
write('Sum:=', sum);
end.
var
i: integer;
pr, sum, a: real;
begin
readln(a);
pr := 1;
sum := 1 / a;
for i := 1 to 10 do
begin
pr := pr * (a + i);
sum := sum + (1 / (a * pr));
end;
write('Sum:=', sum);
end.