for(i=3; i<=12; i=i+1) {
 pinMode(i, OUTPUT);
}
for(;;) {
 while(digitalRead(2)==HIGH) {
   delay(10);
 }
 digitalWrite(i, LOW);
 c = (rand() % 10) + 3;
 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);
}