/*
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	while文　合計と平均　While_02_goukei
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*/
import java.io.*;
import java.text.*;

class While_02_goukei{
	public static void main(String[] args) throws Exception {
		
		int kazu;
		int goukei,kensu;
		double heikin;
		
		goukei=0;
		kensu=0;
		
		DecimalFormat fm=new DecimalFormat("0.00");

		BufferedReader inp=new BufferedReader
			(new InputStreamReader(System.in));
		String keybd;
		
		System.out.print("数を入れてください（0で終了）\n");
		System.out.print("-->");
		keybd=inp.readLine();
		kazu=Integer.parseInt(keybd);
		
		while ( kazu != 0 ) {
			
			goukei = goukei + kazu;
			kensu++;
			
			System.out.print("-->");
			keybd=inp.readLine();
			kazu=Integer.parseInt(keybd);
			
		}
		
		heikin = (double)goukei / kensu;
		
		System.out.print("合計＝"+goukei+"\n");
		System.out.print("件数＝"+kensu+"\n");
		System.out.print("平均＝"+fm.format(heikin)+"\n");
		
	}
}