//Entrees
  //Memoire image
  bool I[3];
  //Identification des broches
  const uint8_t bp1 = 2;
  const uint8_t bp2 = 3;
  const uint8_t bp3 = 4;
//Sorties
  //Memoire image
  bool O[1];
  //Identification des broches
  const uint8_t led = 5;
//Bits internes
  bool B[6];
void setup() {
  // Configuration des broches (entrees)
  pinMode(bp1, INPUT_PULLUP);
  pinMode(bp2, INPUT_PULLUP);
  pinMode(bp3, INPUT_PULLUP);
  // Configuration des broches (sorties)
  pinMode(led, OUTPUT);
  // Initialisation des bits internes
  memset(B, false, sizeof(B));
}
void loop() {
  // Acquisition des entrees
  I[0] = (digitalRead(bp1) == LOW);
  I[1] = (digitalRead(bp2) == LOW);
  I[2] = (digitalRead(bp3) == LOW);
  //Traitement des bits internes
  B[0] = I[0] && !(B[1]);
  B[1] = I[0];
  B[2] = I[1] && !(B[3]);
  B[3] = I[1];
  B[4] = I[2] && !(B[5]);
  B[5] = I[2];
  //Traitement des sorties
  O[0] = !(O[0]) && (B[0] || B[2] || B[4]) || O[0] && !(B[0]) && !(B[2]) && !(B[4]);
  // Ecriture des sorties
  digitalWrite(led, O[0] ? HIGH : LOW);
}