#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; }

signed main(){
	int aa, bb, cc;
	cin >> aa >> bb >> cc;
	__int128 a = aa, b = bb, c = cc;
	__int128 l = 0, r=c;
	while(r-l > 1){
		__int128 mid = (l+r)/2;
		if(mid+(b-1)*(mid/a) >= c){
			r = mid;
		}else{
			l = mid;
		}
	}

	cout << (int)r << endl;

	return 0;
}