INF = 10 ** 9
d = int(input())


def calc(a, b, c):  # a < b < c
    fb = max(0, (b - c + 1 + d - 1) // d)
    b = max(0, b - d * fb)
    fa = max(0, (a - b + 1 + d - 1) // d)
    a = max(0, a - d * fa)
    return fa + fb if a < b < c else INF


H = [int(input()) for i in range(3)]
a = min(calc(H[1], H[0], H[2]), calc(H[1], H[2], H[0]))
b = min(calc(H[0], H[2], H[1]), calc(H[2], H[0], H[1]))
ans = min(a, b)
print(-1 if ans == INF else ans)