#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ll d;
    vector<ll> a(3);
    cin >> d >> a[0] >> a[1] >> a[2];
    auto f0 = [&](ll v1, ll v2, ll v3){
        if(v1 == v3)return false;
        if(v2 > max(v1, v3))return true;
        return (v2 < min(v1, v3));
    };
    auto f1 = [&](ll v1, ll v2, ll v3){
        ll ans = 0;
        if(v1 == v3)v1 -= d, ans++;
        v1 = max(v1, 0ll);
        ll mn = min(v1, v3);
        if(mn == 0 || d == 0)return 1ll << 60;
        ll c = (max(0ll, v2 - (mn - 1)) + d - 1) / d;
        v2 -= c * d, ans += c;
        v2 = max(v2, 0ll);
        return (f0(v1, v2, v3) ? ans : 1ll << 60);
    };
    auto f2 = [&](ll v1, ll v2, ll v3){
        ll ans = 0;
        if(d == 0)return 1ll << 60;
        ll c = (max(0ll, v1 - (v2 - 1)) + d - 1) / d;
        ans += c, v1 -= d * c, v1 = max(v1, 0ll);
        c = (max(0ll, v3 - (v2 - 1)) + d - 1) / d;
        ans += c, v3 -= d * c, v3 = max(v3, 0ll);
        if(v1 == v3){
            v1 -= d, v1 = max(v1, 0ll);
        }
        return (f0(v1, v2, v3) ? ans : 1ll << 60);
    };
    ll ans = min(f1(a[0], a[1], a[2]), f2(a[0], a[1], a[2]));
    if(f0(a[0], a[1], a[2]))ans = 0;
    if(ans >> 60)ans = -1;
    cout << ans << '\n';
}