/Java/Program Pr115_3; var k, n : integer; suma : real; begin readln(n); suma := 0; for k := 1 to n do suma := suma + 1 / sqr(2*k+1); writeln(suma); readln; end.

Program Pr115_3; var k, n : integer; suma : real; begin readln(n); suma := 0; for k := 1 to n do suma := suma + 1 / sqr(2*k+1); writeln(suma); readln; end.

program Pr115_3;
var
  k, n : integer;
  suma : real;

begin
  readln(n);
  suma := 0;
  for k := 1 to n do
  suma := suma + 1 / sqr(2*k+1);
  writeln(suma);
  readln;
end.

Source: abramov.org.ua

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