var x,t,e,s:real;
n:integer;
begin
write('|x|<1 x=');
readln(x);
x:=abs(x);
e:=0.0001;
n:=0;
t:=1;
s:=t;
while abs(t)>e do
begin
n:=n+1;
t:=-t*x*(2*n-1)/(2*n);
s:=s+t;
end;
writeln('S=',s:0:4);
write('f=',1/sqrt(1+x):0:4);
end.
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