import java.util.Arrays;

public class L0455 {
    public static void main(String[] args) throws Exception {
        int[] g = { 10, 9, 8, 7 };
        int[] s = { 5, 6, 7, 8, 6 };
        System.out.print(findContentChildren(g, s));
    }

    public static int findContentChildren(int[] g, int[] s) {
        int i, j;
        int g_num = g.length;
        int s_num = s.length;
        Arrays.sort(g);
        Arrays.sort(s);
        int sum = 0;
        int a = 0;
        int position = 0;
        for (i = 0; i < s_num; i++) {
            for (j = position; j < g_num; j++) {
                a += 1;
                if (s[i] >= g[j]) {
                    // System.out.println(s[i]);
                    // System.out.println(g[j]);
                    sum = sum + 1;
                    position = j + 1;
                    j = g_num;
                }

            }
        }
        // System.out.println(a);
        return sum;
    }
}