#include<LCD_I2C.h>
#define BUTTON(n) n+2
#define LED 7
LCD_I2C lcd(0x27,20,4);
int variable[]={0,0,0,0,0};
unsigned long long last[3];
char prestate[]={0,0,0,0,0},state[]={0,0,0,0,0},isToggled=0,delay0=100,times=0;
void setup(){
  pinMode(BUTTON(0),INPUT_PULLUP),
  pinMode(BUTTON(1),INPUT_PULLUP),
  pinMode(BUTTON(2),INPUT_PULLUP),
  pinMode(BUTTON(3),INPUT_PULLUP),
  pinMode(BUTTON(4),INPUT_PULLUP),
  pinMode(LED,OUTPUT),
  lcd.begin(),
  lcd.backlight();
  return;
}
void loop(){
  state[0]=!digitalRead(BUTTON(0));
  if(!prestate[0]&&state[0])
    variable[0]++;
  prestate[0]=state[0],
  state[1]=!digitalRead(BUTTON(1));
  if(!prestate[1]&&state[1])
    last[0]=millis(),
    isToggled=1;
  else if(prestate[1]&&!state[1]&&isToggled)
    isToggled=0,
    variable[1]++;
  else if(prestate[1]&&state[1]&&isToggled&&millis()-last[0]>=3000)
    isToggled=0,
    variable[1]--;
  else if(!state[1])
    isToggled=0;
  prestate[1]=state[1],
  state[2]=!digitalRead(BUTTON(2));
  if(!prestate[2]&&state[2])
    last[1]=millis();
  else if(prestate[2]&&state[2]&&millis()-last[1]>=delay0)
    last[1]=millis(),
    variable[2]++,
    delay0-=delay0?1:0;
  else if(!state[2])
    delay0=100;
  prestate[2]=state[2],
  state[3]=!digitalRead(BUTTON(3));
  if(!prestate[3]&&state[3])
    variable[3]=!variable[3],
    digitalWrite(LED,variable[3]);
  prestate[3]=state[3],
  state[4]=!digitalRead(BUTTON(4));
  if(!prestate[4]&&state[4]&&!times)
    last[2]=millis(),
    times++;
  else if(times&&prestate[4]!=state[4]&&millis()-last[2]<250){
    if(times>2)
      variable[4]--,
      times=0;
    else
      last[2]=millis(),
      times++;
  }else if(times&&millis()-last[2]>=250)
    variable[4]++,
    times=0;
  prestate[4]=state[4],
  lcd.clear(),
  lcd.print(variable[0]),
  lcd.setCursor(0,1),
  lcd.print(variable[1]),
  lcd.setCursor(0,2),
  lcd.print(variable[2]),
  lcd.setCursor(0,3),
  lcd.print(variable[4]);
  return;
}