Search wiring.org.co:

This example is for Wiring version 0024+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know.

Variables.
Variables are used for storing values. In this example, changing the values of variables 'a' and 'b' significantly change the light pattern.

    int a = 20;
    int b = 50;
    int c = a*8;
    int d = a*9;
    int e = b-a;
    int f = b*2;
    int g = f+e;

    void setup() {
      pinMode(48, OUTPUT);
    }

    void loop() {
      digitalWrite(48, HIGH);
      delay(a);
      digitalWrite(48, LOW);
      delay(b);
      digitalWrite(48, HIGH);
      delay(c);
      digitalWrite(48, LOW);
      delay(d);
      digitalWrite(48, HIGH);
      delay(e);
      digitalWrite(48, LOW);
      delay(f);
      digitalWrite(48, HIGH);
      delay(g);
    }