int redPushButton = 4;
int greenPushButton = 5;
int ledPin = 2;

void setup() {
  // put your setup code here, to run once:
pinMode(redPushButton , INPUT);
pinMode(greenPushButton , INPUT);
pinMode(ledPin , OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(redPushButton) || digitalRead(greenPushButton))
  {
    digitalWrite(ledPin, HIGH);
  }
  else
    digitalWrite(ledPin, LOW);
}