#include <bits/stdc++.h>
using namespace std;

#define int long long
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

template<class T>T binarySearch(T ok, T ng, auto check){
	while(ok-ng > 1){
		T mid = (ok+ng)/2;
		if(check(mid)) ok = mid;
		else ng = mid;
	}
	return ok;
}

signed main(){
	int aa, bb, cc;
	cin >> aa >> bb >> cc;
	__int128 a = aa, b = bb, c = cc;
	cout << (int)binarySearch(c, (__int128)0, [&](int mid){ return (mid+(b-1)*(mid/a) >= c); }) << endl;
	return 0;
}