1.
uses crt;
const n=100;
var i,j:integer;
begin
for i:=1 to n do
for j:=1 to n do
if i+j=i*j then
writeln(i,' ',j);
end.
2.
uses crt;
const n=100;
var i:integer;
begin
for i:=2 to n do
write(power(i,3),' ');
end.
3.
uses crt;
var n:integer;
begin
read(n);
writeln((n div 3)*2);
end.