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................| A |

.............| B | C |

..........| D | E | F |

.......| -7 | 5 | -2 | 11 |

D = -7 + 5 = -2

E = 5 - 2 = 3

F = -2 + 11 = 9

B = -2 + 3 = 1

C = 3 + 9 = 12

A = 1 + 12 = 13

................| 13 |

.............| 1 | 12 |

..........| -2 | 3 | 9 |

.......| -7 | 5 | -2 | 11 |

................| 5 |

.............| G | H |

..........| J | -3 | K |

.......| -7 | L | -8 | M |

L - 8 = -3

L = 8 - 3 = 5

J = -7 + 5 = -2

G = -2 - 3 = -5

H - 5 = 5

H = 5 + 5 = 10

-3 + K = 10

K = 10 + 3 = 13

M - 8 = 13

M = 13 + 8 = 21

................| 5 |

.............| -5 | 10 |

..........| -2 | -3 | 13 |

.......| -7 | 5 | -8 | 21 |