#define led_1 13
#define push 4 
int a=0;
int count1=2;
void pin_dec()
{
  pinMode(led_1, OUTPUT);
  pinMode(push,INPUT);
}
void setup() {
    //time_set();
    Serial.begin(9600);
    pin_dec();

    
    // put your setup code here, to run once:

}


void loop() {
  
  task1_on();
  }
void task1_on()
{       //Serial.println(count1++);
        a=digitalRead(push);
        
        if(count1%2==0  && a==HIGH)
          {
             // Serial.println(count1%2);
               led_on();
               count1++;
              // Serial.println(count1);

          } 
       if(count1%2!=0  &&  a==HIGH)
          {
             //Serial.println(count1%2);
               led_off();
               count1++;
              //Serial.println(count1);
          }
 }

 // count1=0;



void led_on()
{
      digitalWrite(led_1, HIGH);
          //Serial.println(count1);
}
void led_off()
{
     digitalWrite(led_1, LOW);
}