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);
		long cnt = 0;
		cnt += n[0];
		n[1] -= n[0];
		n[2] -= n[0];

		boolean flag = true;
		while(flag) {
			if(n[1] <= 2 && n[2] <= 2) {
				flag = false;
			}else {
				if(n[2] >= n[1] && n[2] - 3 >= 0 && n[1] >= 1) {
					n[2] -= 3;
					n[1] --;
					cnt ++;
				}else if(n[1] - 3 >= 0 && n[2] >= 1) {
					n[2] --;
					n[1] -= 3;
					cnt ++;
				}else if(n[1] == 0) {
					if(n[2] - 5 >= 0) {
						n[2] -= 5;
						cnt ++;
					}else {
						flag = false;
					}
				}else if(n[2] == 0) {
					if(n[1] - 5 >= 0) {
						n[1] -= 5;
						cnt++;
					}else {
						flag = false;
					}
				}
			}
		}
		System.out.println(cnt);

	}
}