#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000
#define int long long

signed main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int A, B, C;
	cin >> A >> B >> C;
	int ok = 1000000000000000000, ng = 0;
	while ((ok - ng) != 1) {
		int mid = (ok + ng) / 2;
		int money = mid + (mid / A) * (B - 1);
		if (money >= C) ok = mid;
		else ng = mid;
	}
	cout << ok << endl;

    return 0;
}