#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;

bool cmp(int x, int y);
int main()
{
    int n,x;
    scanf("%d %d",&n,&x);
    int* a = new int[n];
    int* b = new int[n];
    for(int i = 0; i < n; i++)
    {
        scanf("%d",&a[i]);
    }
    for(int i = 0; i < n; i++)
    {
        scanf("%d",&b[i]);
    }
    int sum = 0;
    for(int i = 0; i < n; i++)
    {
        if(a[i] <= b[i])
            sum += a[i];
        else
            sum += b[i];
    }
    if(sum > x)
        printf("%d\n",x);
    else
        printf("%d\n",sum);
    delete []a;
    delete []b;
    return 0;
}