import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); // 注意 hasNext 和 hasNextLine 的区别 int n= in.nextInt(); int x = in.nextInt(); int a[] = new int[n]; int b[]= new int[n]; for(int i =0;i<n;i++){ a[i] = in.nextInt(); } for(int i =0;i<n;i++){ b[i] = in.nextInt(); } int total =0; for(int i =0;i<n;i++){ if(a[i]>b[i]){ total+=b[i]; }else { total+=a[i]; } } if(total>x){ System.out.println(x); }else{ System.out.println(total); } } }