def w():
    c = int(input())
    q = int(input())
    n = int(input())
    v = 0
    p = 0
    while p < c:
        p += 1
        v += 1
    if n - p < n // (q + 1):
        while p != n:
            v += 1
            p += 1
    else:
        p -= c
        while p != n:
            v += 1
            p = p + q + 1
    print(v)
w()