for i := 1 to Z do
    for j := 1-X(i) to Y(i)-n*n do
    k:=0

for int i := 1 to 1 do
   for j:= 1-1 to n^2 - n*n

for i:= 1 to N  do
  for j: = 1-n to n^3 - n^2
    for 0 to n^3 - n^2
         n * n^3 + n * n^2**