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 Arduino Nano V3.0 AVR ATmega328P

#include <Adafruit_NeoPixel.h>
#include <EEPROM.h>
#define ledPIN 2
#define redButtonPIN 3
#define greenButtonPIN 4
#define NUMPIXELS 15
uint8_t maxValue EEMEM = 15;
uint8_t currentValue EEMEM;
uint8_t firstByteInEEOROM EEMEM = 0;
uint8_t secondByteInEEOROM EEMEM = 1;
bool isFirstSession = true;

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUMPIXELS, ledPIN, NEO_GRB + NEO_KHZ800);

void setup() {
  if (EEPROM.read(firstByteInEEOROM) == isFirstSession) {
    EEPROM.put(firstByteInEEOROM, false);
    EEPROM.put(secondByteInEEOROM, maxValue);
  }
  currentValue = EEPROM.get(secondByteInEEOROM, currentValue);
  strip.begin();
  strip.show(); 
  pinMode(ledPIN, OUTPUT);
  pinMode(redButtonPIN, INPUT);
  pinMode(greenButtonPIN, INPUT);
 }

void loop() {
  outPixels();
  redButton();
  greenButton();
 }

void outPixels(){

  uint8_t valuePoints = calculationCurrentValue();

    if (currentValue == 0){
      displayRedPixels();
      delay(70);
      displayEmptyPixels();
      delay(70);
      displayRedPixels();
      delay(70);
    } 
    else {
    for (uint8_t displayPixel = 0; displayPixel < valuePoints; displayPixel++){
     strip.setPixelColor(displayPixel, strip.Color(0, 50, 0)); // R, G, B
     strip.show();
    }
   
    for (uint8_t displayRedPixel = maxValue-1; displayRedPixel != valuePoints-1; displayRedPixel--){
      strip.setPixelColor(displayRedPixel, strip.Color(0, 0, 0)); // R, G, B
      strip.show();
    }
   delay(500);
   }
 }

uint8_t calculationCurrentValue(){
  return 0 + currentValue;
 }

void displayRedPixels(){
  for (uint8_t displayRedPixel = 0; displayRedPixel < NUMPIXELS; displayRedPixel++){
      strip.setPixelColor(displayRedPixel, strip.Color(100, 0, 0)); // R, G, B
      strip.show();
     }
 }

void displayEmptyPixels(){
  for (uint8_t displayEmptyPixel = 0; displayEmptyPixel < NUMPIXELS; displayEmptyPixel++){
      strip.setPixelColor(displayEmptyPixel, strip.Color(0, 0, 0)); // R, G, B
      strip.show();
  }
 }

void wrightCurrentValueToStorage() {
  EEPROM.write(secondByteInEEOROM, currentValue);
 }

void redButton(){
  uint8_t redValue = digitalRead(redButtonPIN);
  Serial.print(redValue);
  if (redValue == 1){
    if (currentValue > 0){
    currentValue--;
    wrightCurrentValueToStorage();
    delay(500);
    }
  }
 }

void greenButton(){
  uint8_t greenValue = digitalRead(greenButtonPIN);
  if (greenValue == 1){
    if (currentValue < maxValue){
      currentValue++;
      wrightCurrentValueToStorage();
      delay(500);
      }
    }
 }