#include <Keypad.h>
const int led=10;
int sum=0;
const byte ROWS = 4; 
const byte COLS = 4; 
char hexaKeys[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 customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 
String number ="";
int hum[10]={40,33,65,45,60,44,55,94,30,90};
bool status[10];
int count=0;
void setup(){
  pinMode(led, OUTPUT);
  Serial.begin(9600);
  for(int i=0;i<10;i++){
    status[i]=false;
  }
} 
void loop(){
  char Key = customKeypad.getKey();
  if (Key){
    number += Key;
  if(number.length()==2){
    int num=number.toInt();
    check(num);
  number="";
}}}
void check(int pass) {
  for (int i=0;i<10;i++) {
    if (pass==hum[i]) {
      if (!status[i]) {
        status[i]=true; 
        count++;
        Serial.println(pass);
      } else {
        status[i]=false; 
        count--;
        Serial.println(pass);
      }
    }
  }
  if(count==10){
    digitalWrite(led, HIGH);
  }
  else{
    digitalWrite(led, LOW);
  }
}