program form;
uses crt;
var a :real;
n,k: integer;
begin clrscr;
a:=1;
write('n = '); readln(n);
for k:=1 to n do
a:=(1/(k*k)+1)*a;
writeln('otvet = ', a:3:3);
readkey;
end.
program form;
uses crt;
var a :real;
n,k: integer;
begin clrscr;
a:=1;
write('n = '); readln(n);
for k:=1 to n do
a:=(1/(k*k)+1)*a;
writeln('otvet = ', a:3:3);
readkey;
end.