start := 1000; +− x := start;+− y := start;+− z := start;+− while 0 < x do {+− while 0 < y do {+− while 0 < z do { z := z - 1 };+− z := start;+− y := y - 1+− }; +− y := start;+− x := x - 1+− }+− +−