#define _USE_MATH_DEFINES
 
#include <iostream>
#include <iomanip>
#include <sstream>
 
#include <algorithm>
#include <cmath>
 
#include <string>
#include <queue>
#include <vector>
#include <complex>
#include <set>
#include <map>
#include <stack>
#include <list>
 
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
 
#define PII pair<int,int>
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////
vector<LL> H(3);

bool check(){
	if( H[0] == H[1] || H[1] == H[2] || H[2] == H[1] ){
		return false;
	}else if( H[0] < H[1] && H[2] < H[1] ){
		return true;
	}else if( H[0] > H[1] && H[2] > H[1] ){
		return true;
	}
	return false;
}

LL cut(LL A,LL B,LL C,LL d){
	//A>B>C
	LL ret = 0;
	LL temp;
	if( A <= B ){
		temp = (B-A+d)/d;
		B = B - d*temp;
		if( B < 0 ){
			B = 0;
		}
		if( A > B && B > 0){
			ret += temp;
		}else{
			return -1;
		}
	}
	///////////////
	if( B <= C ){
		temp = (C-B+d)/d;
		C = C - d*temp;
		if( C < 0 ){
			C = 0;
		}

		if( B > C && C >= 0){
			ret += temp;
		}else{
			return -1;
		}
	}
	return ret;
}
void solve(){
	LL d;
	cin >> d;//
	rep(i,3){
		cin >> H[i];
	}
	if( 0 == d ){
		if( check() ){
			cout << 0 << endl;
		}else{
			cout << -1 << endl;
		}
		return;
	}
	//else if(H[0] >= 3*d && H[1]>= 3*d && H[2] >= 3*d){}
	////
	LL ret = -1;
	LL temp;
	//LL cut(int A,int B,int C,int d)
	//(1,0,2)(1,2,0)(0,2,1)(2,0,1)
	temp = cut(H[1],H[0],H[2],d);
	if( temp >= 0 ){if( -1 == ret || temp < ret){ret = temp;}}
	temp = cut(H[1],H[2],H[0],d);
	if( temp >= 0 ){if( -1 == ret || temp < ret){ret = temp;}}
	temp = cut(H[0],H[2],H[1],d);
	if( temp >= 0 ){if( -1 == ret || temp < ret){ret = temp;}}
	temp = cut(H[2],H[0],H[1],d);
	if( temp >= 0 ){if( -1 == ret || temp < ret){ret = temp;}}
	cout << ret << endl;
}

int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    //cout << setprecision(16);//
	
	//cpp
	solve();
	return 0;
}