d = int(input())
inf = 10 ** 18
H = [0] * 3
for i in range(3):
    H[i] = int(input())
    
def check(A, d):
    cnt = 0
    if A[1] >= A[0]:
        cnt = (A[1] - A[0] + 1 + d - 1)//d
        A[1] -= cnt * d
    if A[1] <= 0:
        return inf
    
    if A[2] >= A[1]:
        cnt = (A[2] - A[1] + 1 + d - 1)//d
    
    return cnt
    
ans = inf
ans = min(ans, check([H[1], H[0], H[2]], d))
ans = min(ans, check([H[1], H[2], H[0]], d))
ans = min(ans, check([H[2], H[0], H[1]], d))
ans = min(ans, check([H[0], H[2], H[1]], d))

print(ans) if ans != inf else print(-1)