#!/usr/bin/env python3
d = int(input())
h1 = int(input())
h2 = int(input())
h3 = int(input())
def is_kadomatsu(a, b, c):
    return a != c and ((a < b and b > c) or (a > b and b < c))
def make_lt(a, b):
    if b == 0:
        return float('inf')
    else:
        return max(0, (a - (b-1) + d-1) // d)
def check_count(k1, k2, k3):
    if k1 < 0 or k2 < 0 or k3 < 0:
        return float('inf')
    g1 = max(0, h1 - k1 * d)
    g2 = max(0, h2 - k2 * d)
    g3 = max(0, h3 - k3 * d)
    if is_kadomatsu(g1, g2, g3):
        return k1 + k2 + k3
    else:
        return float('inf')
if d == 0:
    if is_kadomatsu(h1, h2, h3):
        ans = 0
    else:
        ans = -1
else:
    ans = float('inf')
    k1 = make_lt(h1, h2)
    k2 = make_lt(h2, min(h1, h3))
    k3 = make_lt(h3, h2)
    ans = min(ans, check_count(k1,    0, k3  ))
    ans = min(ans, check_count(k1-1,  0, k3  ))
    ans = min(ans, check_count(k1  ,  0, k3-1))
    ans = min(ans, check_count(   0, k2,    0))
    ans = min(ans, check_count(   1, k2,    0))
    ans = min(ans, check_count(   0, k2,    1))
    if ans == float('inf'):
        ans = -1
print(ans)