#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	long long N,K,M;
	cin>>N>>K>>M;
	
	map<long long,long long> mp;
	
	for(long long i=1;i<=1000000;i++){
		long long temp = N;
		
		long long x = 1LL;
		for(int j=0;true;j++){
			temp /= i + K * j;
			if(temp<=0)break;
			x *= i + K * j;
			if(j>=2)mp[x] ++;
		}
	}
	long long cnt = 0LL;
	for(auto &a:mp){
		long long tt = a.first;
		
		long long ok = 0LL,ng = 1000000001;
		while(ng-ok>1){
			long long mid = (ok+ng)/2;
			long long t = N;
			t /= mid;
			t /= mid+K;
			if(t<=0){
				ng = mid;
				continue;
			}
			if(mid * (mid+K)<=tt)ok = mid;
			else ng = mid;
		}
		if(ok * (ok+K) == tt){
			a.second++;
			cnt++;
		}
	}

	long long ans = 0LL;
	if(M>=2){
		for(auto a:mp){
			if(a.second==M)ans++;
		}
	}
	else{
		long long ok = 0LL,ng = 1000000001;
		while(ng-ok>1){
			long long mid = (ok+ng)/2;
			long long t = N;
			t /= mid;
			t /= mid+K;
			if(t<=0){
				ng = mid;
				continue;
			}
			if(mid * (mid+K)<=N)ok = mid;
			else ng = mid;
		}

		ans = ok;
		ans -= cnt;
		
		for(auto a:mp){
			if(a.second==1)ans++;
		}
	}
	
	cout<<ans<<endl;
	
	return 0;
}