🍑 采药

import java.util.*;

class Main{
    static int N = 1010;
    static int[] f = new int[N];
    public static void main(String[] aaa){
        
        Scanner sc = new Scanner(System.in);
        int m = sc.nextInt();
        int n = sc.nextInt();
        for(int i = 0; i < n; i++)
        {
            int v = sc.nextInt();
            int w = sc.nextInt();
            for(int j = m; j >= v; j--){
                f[j] = Math.max(f[j],f[j-v]+w);
            }
        }
        System.out.println(f[m]);
    }
    
}