#include <bits/stdc++.h>
using namespace std;
/*{{{*/  //template
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
constexpr int INF = numeric_limits<int>::max()/2;
constexpr long long LINF = numeric_limits<long long>::max()/3;
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
#define sz(x) (int)(x).size()
#define debug(x) cerr<<#x<<":"<<x<<endl
#define debug2(x,y) cerr<<#x<<","<<#y":"<<x<<","<<y<<endl
//struct fin{ fin(){ cin.tie(0); ios::sync_with_stdio(false); } } fin_;
struct Double{ double d; explicit Double(double x) : d(x){} };
ostream& operator<<(ostream& os,const Double x){ os << fixed << setprecision(20) << x.d; return os; }
template<typename T> ostream& operator<<(ostream& os,const vector<T>& vec){ os << "["; for(const auto& v : vec){ os << v << ","; } os << "]"; return os; }
template<typename T,typename U> ostream& operator<<(ostream& os, const map<T,U>& mp){ os << "{"; for(auto& p : mp){ os << p << ","; } os << "}"; return os; }
template<typename T,typename U> ostream& operator<<(ostream& os,const pair<T,U>& p){ os << "(" << p.first << ","<< p.second <<")"; return os; }
template<typename T> ostream& operator<<(ostream& os,const set<T>& st){ os<<"{"; for(T v:st) os<<v<<","; os <<"}"; return os; }
template<typename T,typename U> inline void chmax(T &x,U y){ if(y>x) x = y; }
template<typename T,typename U> inline void chmin(T &x,U y){ if(y<x) x = y; }
using ll = long long;
using ull = unsigned long long;
using pii = std::pair<int,int>;
using vi = std::vector<int>;
typedef vector<vi> vvi;
ll gcd(ll a,ll b){ if(b==0) return a; else return gcd(b,a%b); }
constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }
//constexpr double eps = 1e-14; 
constexpr double eps = 1e-10; 
constexpr ll mod = 1e9+7;
const int dx[]={1,0,-1,0} ,dy[] = {0,1,0,-1};
/*}}}*/

ll d;

ll minimize(vector<ll> h){
    ll ret = 0;
    if(h[1] == h[2]){
        h[1] = max<ll>(h[1]-d,0);
        ret++;
    }
    if(h[1] == 0) return LINF;

    if(h[0] < h[1]) return ret;
    return (h[0]-(h[1]-1)+d-1)/d + ret;
}

ll maximize(vector<ll> h){
    if(h[0] == 0) return LINF;
    ll ret = 0;
    if(h[0] < h[1]){
        ll t = (h[1] - (h[0] - 1) + d - 1) / d;
        h[1] = max(0LL,h[1] - t * d);
        ret += t;
    }
    if(h[0] < h[2]){
        ll t = (h[2] - (h[0] - 1) + d - 1) / d;
        h[2] = max(0LL,h[2] - t * d);
        ret += t;
    }

    if(h[1] == h[2]){
        h[1] = max<ll>(h[1]-d,0);
        ret++;
    }

    if(h[1] == h[2]){
        return LINF;
    }
    return ret;
}

int main(){
    cin >> d;
    vector<ll> h(3); rep(i,3) cin >> h[i];
    swap(h[0],h[1]);
    if(h[1] > h[2]) swap(h[1],h[2]);

    if(d == 0){
        if(h[1] == h[2]){
            cout << -1 << endl;
            return 0;
        }
        if(h[0] < h[1] && h[0] < h[2]){
            cout << 0 << endl;
            return 0;
        }
        if(h[0] > h[1] && h[0] > h[2]){
            cout << 0 << endl;
            return 0;
        }
    }

    ll ans = min(minimize(h), maximize(h));
    if(ans == LINF){
        cout << -1 << endl;
        return 0;
    }
    cout << ans << endl;
}