import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int n[] = new int[3];
		n[0] = scan.nextInt();
		n[1] = scan.nextInt();
		n[2] = scan.nextInt();
		scan.close();
		Arrays.sort(n);
		int cnt = 0;
		cnt += n[0];
		n[1] -= n[0];
		n[2] -= n[0];

		int a = n[2] / 3;
		if(a >= n[1]) {
			cnt += n[1];
			cnt += (n[2] - 3 * n[1]) / 5;
			System.out.println(cnt);
		}else {
			cnt += a;
			n[1] -= a;
			n[2] -= 3 * a;
			if(n[2] == 0) {
				cnt += n[1] / 5;
			}else if(n[2] == 1){
				if(n[1] - 3 >= 0) {
					cnt += 1;
					n[1] -= 3;
				}
				cnt += n[1] / 5;
			}else {
				if(n[1] - 6 >= 0) {
					cnt += 2;
					n[1] -= 6;
				}else if(n[1] - 3 >= 0) {
					cnt += 1;
					n[1] -= 3;
				}
				cnt += n[1] / 5;
			}
			System.out.println(cnt);
		}
	}
}