#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

constexpr ll INF = 2e18;
inline ll satulating_mul(const ll a, const ll b) {
  if (b == 0) return 0;
  if (a > INF / b) return INF;
  return a * b;
}

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  ll a, b, c;
  cin >> a >> b >> c;
  ll ok = c, ng = 0;
  while (ok - ng > 1) {
    ll mid = (ok + ng) / 2;
    ll cur = satulating_mul(b - 1, mid / a) + mid;
    (cur >= c ? ok : ng) = mid;
  }
  cout << ok << '\n';
  return 0;
}