int led1 = 10;
int led2 = 9;
int led3 = 6;
int led4 = 5;

void setup () {
  pinMode (led1, OUTPUT);
  pinMode (led2, OUTPUT);	
  pinMode (led3, OUTPUT);
  pinMode (led4, OUTPUT);
}

void loop () {
  analogWrite (led1, 64);
  analogWrite (led2, 127);
  analogWrite (led3, 191);
  analogWrite (led4, 255);
}