#include <Keypad.h>
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns

int pass = 54;

int INpass_1 = 0;
int INpass_10 = 0;
int INpass = 0;
int Count = 0;

#define LED_L 13

char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup() {

  Serial.begin(9600);
  Serial.println("Please Enter Key : ");

  pinMode(LED_L,OUTPUT);

}
void loop() {
  
  char key = keypad.getKey();

  if (key != NO_KEY) {
    
    Count++;
    Serial.print("key = ");
    Serial.print(key);
    
    INtime = key - '0';
    power = pow(x, Count);
    
    Serial.print("   : INTkey = ");
    Serial.println(INtime);
    

  }

}