import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[3];
        for (int i = 0; i < 3; i++) {
            arr[i] = sc.nextInt();
        }
        Arrays.sort(arr);
        int ans = arr[0];
        arr[2] -= arr[0];
        arr[1] -= arr[0];
        arr[0] = 0;
        if (arr[1] > 0) {
            int add = Math.min(arr[1], arr[2] / 3);
            ans += add;
            arr[1] -= add;
            arr[2] -= add * 3;
        }
        ans += arr[2] / 5;
        System.out.println(ans);
    }
}