Arduino Uno: Blink and Buzz across all OUTPUT, Photocell at A0 for INPUT Sensor reading

#define BUZZER 13
#define INIT 200
int buzzoff = 1;
int iterator=INIT;
int sensorReading;

void setup() {                
  for (int i=1;i<14;i++) { pinMode(i, OUTPUT);}
}

void loop() {
  if (iterator < 300) {iterator++;}
  else {iterator=INIT;}
  sensorReading = analogRead(A0);
  sensorReading = iterator;
for (int i=1;i<14;i++) { 
                         if (iterator % 3 ==0) {
                         digitalWrite(i, LOW); delay(100);
                          }
                         else { 
                               if (i == BUZZER && buzzoff == 0) {delay(0);}
                               else { analogWrite(i, sensorReading); delay(10); }
                             
                            } 
                       }  
delay(100);  

for (int i=1;i<14;i++) { digitalWrite(i, LOW); }   

}