#include <iostream>

using namespace std;

int main() {
    int n, k, m, detail;
    cin >> n >> k >> m;
    if (n > k && k > m) {
        int r = n % k;
        detail = (n / k) * (k / m);
        r += (k % m) * (n / k);
        while (r / k > 0) {
            detail += (r / k) * (k / m);
            r = r % k + k % m;
        }
        cout << detail;
    } else {
        cout << 0;
    }
}