#include <bits/stdc++.h>
using namespace std;
#define int long long

main()
{
    //ifstream cin("input.txt");
    //ofstream cout("output.txt");
    int a,b,c,n;
    cin>>n>>a>>b>>c;
    int m = n;
    int ans1 = m/a;
    m -= ans1*a;
    while(m >= b)
    {
        ans1 += m/b;
        m = m-m/b*b + m/b*c;
    }
    int ans2 = 0;
    while(n >= b)
    {
        ans2 += n/b;
        n = n - n/b*b + n/b*c;
    }
    ans2 += n/a;
    cout<<max(ans1,ans2);
}