void setup() {
for (byte 1-0;1<4;i++) { 
  pinMode (Led [1], OUTPUT);
}
}
void loop () {
digitalWrite(Led[0],(X & B00000001)); 
digitalWrite (Led[1],(X & B00000010)); 
digitalWrite (Led[2],(X & B00000100));
digitalWrite(Led[3],(X & B00001000)); 
delay (300);
X++;
if (X16) X-0
}