#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll v, t, p;
    cin >> v >> t >> p;

    ll hoge = v * (p + 1);
    ll foo = (hoge - 1) / (t - 1) + 1;
    //cerr << foo << newl;
    cout << 1 + (foo - 1) * t + (hoge - (t - 1) * (foo - 1)) << newl;

    return 0;
}