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

long long a, b, c, upp, low, mid;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(0);
	
	cin >> a >> b >> c;
	upp = c, low = 1;
	while (upp-low>1) {
		mid = (upp+low)/2;
		long long tmp = mid/a*b + mid - mid/a;
		if (tmp<c) low = mid;
		else if (tmp>=c) upp = mid;
	}
	if (low/a*b + low - low/a == c) cout << low << "\n";
	else cout << upp << "\n";
}