import sys
from collections import defaultdict
sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


N,K,M = MI()

count = defaultdict(int)
for B in range(1,21):
    for A in range(1,10**9+1):
        x = 1
        for k in range(B+1):
            x *= A+k*K
        if x <= N:
            count[x] += 1
        else:
            break

ans = 0
for key in count.keys():
    if count[key] == M:
        ans += 1

print(ans)