import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		double a = sc.nextDouble();
		double b = sc.nextDouble();
		double c = sc.nextDouble();
		double sum;
		sum = a + b + c;
		double s;
		if(sum < 200){
			s = sum * 0.9;
			System.out.println(String.format("%.1f", s));
		}else if(sum >= 200){
			s = sum * 0.8;
			System.out.println(String.format("%.1f", s));
		}
	}

}
/**************************************************************
	Problem: 1624
	User: admin
	Language: Java
	Result: Accepted
	Time:1145 ms
	Memory:40796 kb
****************************************************************/