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int red = 13;
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int yellow = 12;
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int green = 11;
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void setup() {
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  pinMode(red, OUTPUT);
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  pinMode(yellow, OUTPUT);
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  pinMode(green, OUTPUT);
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}
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void loop() {
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  // Green
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  digitalWrite(green, HIGH);
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  digitalWrite(yellow, LOW);
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  digitalWrite(red, LOW);
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  delay(5000);
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  // Yellow
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  digitalWrite(yellow, HIGH);
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  digitalWrite(green, LOW);
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  digitalWrite(red, LOW);
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  delay(2000);
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  // Red
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  digitalWrite(red, HIGH);
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  digitalWrite(green, LOW);
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  digitalWrite(yellow, LOW);
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  delay(3000);
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}