#include <bits/stdc++.h>
using namespace std;

long long n, k, m;



int main(){
    cin >> n >> k >> m;
    long long a = 1;
    long long Key[n + 1] = {0};
    while (a*(a + k) <= n){
        long long cur = a*(a + k);
        for (int i = 2; cur <= n; cur *= (a + k*i)){
            ++Key[cur];
        }
        ++a;
    }
    long long res = 0;
    for (long long i = 1; i <= n; ++i){
        if (Key[i] == m) ++res;
    }
    cout << res << endl;
}