public class MainClass {
    public static void main(String args[]) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
    	int n1 = sc.nextInt();
    	int n2 = sc.nextInt();
    	int n3 = sc.nextInt();
    	int ar[] = {n,n1,n2,n3};
    	int a = ar.length;
    	int res = (ar[0] + ar[1] + ar[2] + ar[3])/a;
    	System.out.println(res);
    	
    
    }
    	

java.util.Scanner scan = new java.util.Scanner(System.in);
int count, sum = 0;
for (count = 0; scan.hasNextInt(); count++) {
    sum += scan.nextInt();
}
System.out.println("Result: " + (sum / count));