int c;
int i;

void setup()
{
    randomSeed(analogRead(0));
    for(i=3; i<=12; i=i+1) {
        pinMode(i, OUTPUT);
    }
}

void loop()
{
    while(digitalRead(2)==HIGH) {
        delay(10);
    }

    digitalWrite(i, LOW);
    c = random(3, 12+1);

    for(i=0; i<=20+c; i=i+1) {
        digitalWrite(((i%10)+3), HIGH);
   	delay(200);
   	digitalWrite(((i%10)+3), LOW);
   	delay(200);
    }
    i = i - 1;
    digitalWrite(i, HIGH);
    delay(100);
    digitalWrite(i, LOW);
    delay(100);
    digitalWrite(i, HIGH);
    delay(100);
    digitalWrite(i, LOW);
    delay(100);
    digitalWrite(i, HIGH);
}