/*
-------------------------------------------------
	while文	入力した数の合計	While_02_goukei
-------------------------------------------------
*/
import java.io.*;
import java.text.*;
class While_02_goukei {
	public static void main(String[] args) throws Exception {
		
		BufferedReader inp=new BufferedReader
			(new InputStreamReader(System.in));
		String keybd;
		
		int kazu,goukei,kensu;
		double heikin;
		
		goukei=0;
		kensu=0;
		
		System.out.print("整数を入力して下さい（０で終了）\n-->");
		keybd=inp.readLine();
		kazu=Integer.parseInt(keybd);
		
		while ( kazu!=0 ) {
			
			goukei+=kazu;
			kensu++;
	
			System.out.print("-->");
			keybd=inp.readLine();
			kazu=Integer.parseInt(keybd);

		}
		heikin=(double)goukei/kensu;		
		
		System.out.print("\n合計＝"+goukei+"\n");
		System.out.print("件数＝"+kensu+"\n");
		
		DecimalFormat fm=new DecimalFormat("#.00");
		System.out.print("平均＝"+fm.format(heikin)+"\n");
	}
}