#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <map>
#include <iomanip>
#include <stdio.h>
#include <math.h>
#include <queue>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

#define rep(i,n) for(int i = 0; i < (n); i++)
#define pb push_back 
#define eb emplace_back 
#define fi first
#define se second
#define all(x) x.begin() , x.end()
#define vi vector<int>
#define vll vector<ll>
#define vb vector<bool>

const static int INF = 1001001001;
const static ll LINF = 1001001001001001001LL;
const static ld PI = 3.1415926535897932384626L;
const static int MOD = int(1e9) + int(7);
//const static ll MOD = ll(1e9) + ll(7);
//const static int MOD = 998244353;
//const static int MOD = 998244353;
const static int MX = 202020;

ll gcd (ll a , ll b) { if (a < b) swap(a , b); if (a % b == 0) return b; else return gcd (b , a % b); }
ll lcm (ll a , ll b) { return (a / gcd (a , b) * b); }
int keta (ll x) { int ret = 0; while(x) { ret++; x /= 10; } return ret; }
inline int in () { int x; scanf("%d" , &x); return x; }
inline ll lin () { ll x; scanf("%lld" , &x); return x; }

/*
//memo
v.erase(unique(all(v)), v.end());
*/

int main () {
    ull a , b , c;
    cin >> a >> b >> c;
    ull ok = (ll)(1LL<<63)-1;
    ull ng = -1;
    while (ok - ng > 1) {
        ull mid = (ok + ng) / 2;
        ull cost = mid - mid / a + mid / a * b;
        if (cost >= c) ok = mid;
        else ng = mid;
    }
    cout << ok << endl;
    return 0;
}