import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
public class MainClass {
public static int[] readFrom(String filePath)throws IOException {
FileInputStream fis=new FileInputStream(filePath);
DataInputStream dis = new DataInputStream(fis);
int length = dis.readInt();
int[] array = new int[length];
for (int i =0;i<length;i++){
array[i]=dis.readInt();
}
return array;
}
public static void main(String[] args) {
String filePath = args[0];
try {
int [] array = readFrom(filePath);
double sum = 0;
for (int j : array) {
sum = sum + j;
}
double average = sum / (double) array.length;
System.out.print(average);
} catch (IOException e) {
e.printStackTrace();
}
}
}
