import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int[] ar = new int[3];
		ar[0] = sc.nextInt();
		ar[1] = sc.nextInt();
		ar[2] = sc.nextInt();
		int num = 0;
		int min = Math.min(ar[0],Math.min(ar[1],ar[2]));
		num += min;
		ar[0] -= min;
		ar[1] -= min;
		ar[2] -= min;
		Arrays.sort(ar);
		
		while (ar[1]>=1 && ar[2]>=3) {
			ar[1] -= 1;
			ar[2] -= 3;
			num++;
			Arrays.sort(ar);
		}
		
		while (ar[2] >= 5) {
			ar[2] -= 5;
			num++;
		}
		
		System.out.println(num);
	}
}