def main():
    data = []
    n = input().split()
    a = int(n[0])
    b = int(n[1])
    c = int(n[2])
    div = 0

    for i in range(a,b):
        if c % i == 0:
            div += 1

    print(div)

if __name__ == '__main__':
    main()