int grades[7] = {75, 87, 68, 92, 100, 80, 89};
void setup() {
  Serial.begin(9600);
  int average = 0;
  for (int i = 0; i < 7; i++) {
    average = average + grades[i];
  }
  average = average / 7;
  Serial.print("Your average grade is:");
  Serial.println(average);
  if (average >= 85) {
    Serial.println("Congratulations! you are a top student");
  }
  else {
    Serial.println("Try harder next year");
  }
}

void loop() {
}