from ast import Mod
import bisect
import copy
import decimal
import fractions
import heapq
import itertools
import math
import random
import sys
import time
from collections import Counter,deque,defaultdict
from functools import lru_cache,reduce
from heapq import heappush,heappop,heapify,heappushpop,_heappop_max,_heapify_max
def _heappush_max(heap,item):
    heap.append(item)
    heapq._siftdown_max(heap, 0, len(heap)-1)
def _heappushpop_max(heap, item):
    if heap and item < heap[0]:
        item, heap[0] = heap[0], item
        heapq._siftup_max(heap, 0)
    return item
from math import gcd as GCD
read=sys.stdin.read
readline=sys.stdin.readline
readlines=sys.stdin.readlines
write=sys.stdout.write

D=int(readline())
H=[int(readline()) for _ in range(3)]
inf=1<<60
ans=inf
for tpl in itertools.permutations([0,1,2]):
    if tpl[1]==1:
        continue
    cnt=0
    HH=H[:]
    for a,b in zip(tpl[:-1],tpl[1:]):
        if HH[a]<=HH[b]:
            c=(HH[b]-HH[a])//D+1
            HH[b]-=c*D
            cnt+=c
            HH[b]=max(HH[b],0)
    if len(set(HH))==3 and HH[1] in (min(HH),max(HH)) and all(h>=0 for h in HH):
        ans=min(ans,cnt)
if ans==inf:
    ans=-1
print(ans)