import java.io.*;

/* Konzolový vstup - řádkový vstup: soubor Vstup.java*/
/* Soucet a prumer tri cisel a,b,c */

public class RadkovyVstup {
    static double p;
    static int s, a, b, c;
  
  
    public static void main(String[] args) throws IOException {
        BufferedReader vstup = new BufferedReader(new InputStreamReader(System.in));
    
        System.out.print("Zadej a: ");
        a = (new Integer(vstup.readLine())).intValue();

        System.out.print("Zadej b: ");
        b = (new Integer(vstup.readLine())).intValue();

        System.out.print("Zadej c: ");
        c = (new Integer(vstup.readLine())).intValue();

    
        s = a + b + c;
        System.out.println("soucet tri cisel s = " + s);
    
        p = (float) s / 3;
        System.out.println("prumer tri cisel p = " + p);


  
        vstup.close();
  }

}