import java.util.Scanner;
public class AvgTemp {
  public static void main(String[] args) {
    int i; float[] temp; float sum=0.0f,avg_temp;
    temp = new float[12];
    Scanner scan = new Scanner(System.in);
    for (i=0;i<12;i++)	{
      System.out.print("temp[" + (i+1) + "] = ");
      temp[i] = scan.nextFloat();
      sum = sum + temp[i];
    }
    avg_temp = sum/12;
    System.out.printf("average temperature = "
            + "%.2f\n",avg_temp);
  }
}