void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(4, OUTPUT);
  pinMode(25, INPUT);
  pinMode(26, INPUT);
  pinMode(15, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int taster1 = digitalRead(25);
  int taster2 = digitalRead(26);
  if (!taster1) {
    digitalWrite(4, HIGH);
  } else {
    digitalWrite(4, LOW);
  }
  if (taster2) {
    digitalWrite(15, HIGH);
  } else {
    digitalWrite(15, LOW);
  }
  delay(100);
}