#include <avr/io.h>
#include <util/delay.h>

#define INPUT_PIN  (1 << PB3) // PB3 as input
#define OUTPUT_PIN (1 << PB1) // PB1 as output

void setup() {
  DDRB &= ~INPUT_PIN; // Set PB3 as input
  DDRB |= OUTPUT_PIN; // Set PB1 as output
}

void loop() {
  static uint8_t highCount = 0; // Counter for high signals

  if (PINB & INPUT_PIN) { // If PB3 is high
    if (PINB & INPUT_PIN) { // Check again to confirm
      highCount++; // Increment high signal counter
      if (highCount == 2) { // If two high signals are detected
        PORTB |= OUTPUT_PIN; // Set PB1 high
      
        PORTB &= ~OUTPUT_PIN; // Set PB1 low
        highCount = 0; // Reset high signal counter
      }
    }
  } else {
    highCount = 0; // Reset high signal counterif input is not high
  }

}

int main() {
  setup();
  while (1) {
    loop();
  }
  return 0;
}