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

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    ll A,B,C; cin >> A >> B >> C;
    if(B == 1){ cout << C << endl; return 0; }
    cout << [&]() {
        ll ng = 0, ok = 1e18;
        while(ok - ng > 1) {
            ll mid = (ok + ng) / 2;
            ([&](ll x) {
                // return x + x / A * (B - 1) >= C;
                return x / A >= (C - x + B - 1 - 1) / (B - 1);
            }(mid) ? ok : ng) = mid;
        }
        return ok;
    }() << endl;
}