d = int(input())
H = [int(input()) for _ in range(3)]
if H[0] == H[1] == 0:
    print(-1)
    exit()
if H[1] == H[2] == 0:
    print(-1)
    exit()

ans = []

# 真ん中を高く
if H[1] > 0:
    cnt = 0
    h1, h2, h3 = H
    if h1 >= h2:
        dif = h1 - h2 + 1
        cnt += (dif + d - 1) // d
    if h3 >= h2:
        dif = h3 - h2 + 1
        cnt += (dif + d - 1) // d
    ans.append(cnt)

# 真ん中を低く
if H[0] != 0 and H[2] != 0:
    cnt = 0
    h1, h2, h3 = H
    if h2 >= h1:
        dif = h2 - h1 + 1
        cnt += (dif + d - 1) // d
    h2 -= cnt * d
    h2 = max(0, h2)
    if h2 >= h3:
        dif = h2 - h3 + 1
        cnt += (dif + d - 1) // d
    ans.append(cnt)

print(min(ans))