d = int(input())
H1 = int(input())
H2 = int(input())
H3 = int(input())

impossible = 9999999999

ans = impossible


def A(a, b, c):
    result = 0
    if a == c:
        if a <= d:
            return impossible
        else:
            a = max(0, a - d)
            result += 1
    m = min(a, c)

    if b >= m:
        sa = b - m
        bb = sa // d + 1
        result += bb
    return result


def B(a, b, c):
    result = 0
    if b == 0:
        return impossible
    if a >= b:
        sa = a - b
        aa = sa // d + 1
        result += aa
        a = max(0, a - aa * d)
    if c >= b:
        sa = c - b
        cc = sa // d + 1
        result += cc
        c = max(0, c - cc * d)
    if a == c:
        if a == 0:
            return impossible
        result +=1
    return  result

ans = min(A(H1,H2,H3),B(H1,H2,H3))

print(-1 if ans == impossible else ans)