/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.
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