int pausa=100;
void setup() {
  // put your setup code here, to run once:
for (int i=0; i<10; i++)pinMode(i, OUTPUT);
pinMode (13,INPUT_PULLUP);
pinMode (12,INPUT_PULLUP);
randomSeed(analogRead(0));
}


void loop() {

if (digitalRead(13)) {
 pausa+=100;

}
{for (int i=0; i<10; i++)
  {
    digitalWrite(i, HIGH);
    delay(pausa);

  }
}

  // put your main code here, to run repeatedly:

}