#include <LiquidCrystal_I2C.h>
const int buttonPin = 2;    
int button_State = 0;
int count_value =0;
int prestate =0;
LiquidCrystal_I2C lcd(0x27,16,2);

void setup() {
  // put your setup code here, to run once:
// initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(4,0);
  lcd.print("Counter");
  lcd.setCursor(2,1);
  lcd.print(count_value);

}

void loop() {
  // put your main code here, to run repeatedly:
// read the state of the pushbutton value:
  button_State = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (button_State == HIGH && prestate == 0) {
    count_value++;  
  lcd.setCursor(0,1);
  lcd.print("> ");
  lcd.print(count_value);
  lcd.print(" ");
    prestate = 1;
  }
 else if(button_State == LOW) {
    prestate = 0;
  }

}