package contest; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Arrays; import java.util.InputMismatchException; public class Q661 { InputStream is; PrintWriter out; String INPUT = ""; void solve() { int d = ni(); int[] a = na(3); if(d == 0){ if(a[0] != a[1] && a[1] != a[2] && a[2] != a[0]){ out.println(0); }else{ out.println(-1); } return; } long min = Long.MAX_VALUE; { int[] b = Arrays.copyOf(a, 3); long num = 0; for(int i = 0;i < 3;i+=2){ if(b[i] >= b[1]){ num += (b[i]-b[1])/d+1; b[i] = b[i]-((b[i]-b[1])/d+1)*d; if(b[i] < 0)b[i] = 0; } } if(b[0] == b[2] && b[0] > 0){ num++; } if(b[0] == b[1] || b[1] == b[2] || b[2] == b[0]){ }else{ min = Math.min(min, num); } } { int[] b = Arrays.copyOf(a, 3); long num = 0; if(b[0] == b[2]){ b[0] = Math.max(0, b[0]-d); num++; } if(b[1]-Math.min(b[0],b[2]) >= 0){ num += (b[1]-Math.min(b[0],b[2]))/d+1; b[1] = b[1] - ((b[1]-Math.min(b[0],b[2]))/d+1)*d; b[1] = Math.max(b[1], 0); } if(b[0] == b[1] || b[1] == b[2] || b[2] == b[0]){ }else{ min = Math.min(min, num); } } out.println(min == Long.MAX_VALUE ? -1 : min); } void run() throws Exception { is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes()); out = new PrintWriter(System.out); long s = System.currentTimeMillis(); solve(); out.flush(); if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); } public static void main(String[] args) throws Exception { new Q661().run(); } private byte[] inbuf = new byte[1024]; private int lenbuf = 0, ptrbuf = 0; private int readByte() { if(lenbuf == -1)throw new InputMismatchException(); if(ptrbuf >= lenbuf){ ptrbuf = 0; try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); } if(lenbuf <= 0)return -1; } return inbuf[ptrbuf++]; } private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); } private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; } private double nd() { return Double.parseDouble(ns()); } private char nc() { return (char)skip(); } private String ns() { int b = skip(); StringBuilder sb = new StringBuilder(); while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ') sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } private char[] ns(int n) { char[] buf = new char[n]; int b = skip(), p = 0; while(p < n && !(isSpaceChar(b))){ buf[p++] = (char)b; b = readByte(); } return n == p ? buf : Arrays.copyOf(buf, p); } private char[][] nm(int n, int m) { char[][] map = new char[n][]; for(int i = 0;i < n;i++)map[i] = ns(m); return map; } private int[] na(int n) { int[] a = new int[n]; for(int i = 0;i < n;i++)a[i] = ni(); return a; } private int ni() { int num = 0, b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private long nl() { long num = 0; int b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); } }