View Code of Problem 140

import java.util.*;
import java.math.*;
public class Main {
	public static void main (String[] args) {
		Scanner in = new Scanner(System.in);
		BigDecimal sum = BigDecimal.ZERO;
		for(int i =0;i<12;i++) {
			BigDecimal bd = new BigDecimal(in.next());
			sum=sum.add(bd);
		}
		sum=sum.divide(new BigDecimal("12"));
		System.out.println(sum.stripTrailingZeros().toPlainString());
	}
}