int led = 8;
int button = 3;

int buttonState =0;
int brightness = 0;
int brightup = 15;

void setup() {
pinMode(led, OUTPUT);
pinMode(button, INPUT);
}

void loop() {
analogWrite(led, brightness);

buttonState = digitalRead(button);

if ( buttonState == HIGH ) {
brightness = brightness + brightup;
}
if ( brightness == 255 ) {
brightness = 0;
}
delay(30);
}