11. (30+35)*(30+25) = 3025

program exExhaustive11_1;
var
     f, s : integer;
begin
     for f := 10 to 99 do
         for s := 0 to 99 do
             if (s+f)*(s+f) = f*100+s then writeln(f*100+s);
     readln;
end.