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

public class No91 {

	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		int[] rgb = new int[3];
		for(int i = 0;i < 3;i++) {
			rgb[i] = scanner.nextInt();
		}
		scanner.close();
		
		Arrays.sort(rgb);

		int count = 0 , d = 0;
		count = rgb[0];
		
		rgb[1] -= rgb[0];
		rgb[2] -= rgb[0];
		rgb[0] = 0;

		d= Math.min((rgb[2]-rgb[1])/2, rgb[1]);
		count += d;
		rgb[1] -= d;
		rgb[2] -= d*3;

		if(rgb[1] == 0) {
			count += rgb[2] / 5;
		}else {
			count += (rgb[1] / 4) * 2;
			rgb[1] %= 4;
			rgb[2] %= 4;

			if(rgb[1]+rgb[2]>=4 && (rgb[1] != 2 || rgb[2] != 2)) {
				count++;
			}
		}

		System.out.println(count);

	}

}