#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define int long long
using namespace std;
typedef pair<int, int> P;
const int INF = 2e18;

int a, b, c;

bool f(int mid){
    int tmp = mid / a;
    int res = (b - 1) * tmp + mid;
    return res >= c;
}

signed main(){
    cin >> a >> b >> c;
    int ng = 0, ok = 1e18 + 1;
    while(ok - ng > 1){
        int mid = (ok + ng) / 2;
        if(f(mid)) ok = mid;
        else ng = mid;
    }
    cout << ok << endl;
}