a, b, c = map(int, input().split())
result = -1
if b < c:
    result = a // (c - b) + 1
    print(result)
else:
    print(result)

4190263a83df98eb429866206cade30a0cda8a8c
<mask token>

<mask token>
if b < c:
    result = a // (c - b) + 1
    print(result)
else:
    print(result)

a, b, c = map(int, input().split())
result = -1
if b < c:
    result = a // (c - b) + 1
    print(result)
else:
    print(result)
