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

long long int n, k, m;



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