import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) {
		BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
		try {
			String[] abox = read.readLine().split(" ");
			String[] bbox = read.readLine().split(" ");
			String[] cbox = read.readLine().split(" ");
			int[] a = new int[2];
			int[] b = new int[2];
			int[] c = new int[2];

			for (int i = 0; i < 2; ++i) {
				a[i] = Integer.parseInt(abox[i]);
				b[i] = Integer.parseInt(bbox[i]);
				c[i] = Integer.parseInt(cbox[i]);
			}

			if (a[1] - c[0] < 0) {
				b[0] += Math.abs(a[1] - c[0]);
				a[0] += a[1] - c[0];
			}

			if (b[0] - c[1] < 0) {
				a[0] += b[0];
			} else {
				a[0] += c[1];
			}

			System.out.println(a[0]);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}