Uses Crt;
const n=12;
var x,a,S:real;
i:integer;
begin
readln(x);
a:=sin(x); S:=0; i:=1;
repeat
begin
a:=sin(a);
S:=S+a;
inc(i);
end;
until i=n;
writeln(S);
end.
Uses Crt;
const n=12;
var x,a,S:real;
i:integer;
begin
readln(x);
a:=sin(x); S:=0; i:=1;
repeat
begin
a:=sin(a);
S:=S+a;
inc(i);
end;
until i=n;
writeln(S);
end.