#include <iostream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <cassert>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <bitset>
#include <string>
#include <algorithm>
#include <utility>
#define llint long long
#define inf 1e18
#define rep(x, s, t) for(llint (x) = (s); (x) < (t); (x)++)
#define Rep(x, s, t) for(llint (x) = (s); (x) <= (t); (x)++)
#define chmin(x, y) (x) = min((x), (y))
#define chmax(x, y) (x) = max((x), (y))

using namespace std;
typedef pair<llint, llint> P;

llint v, t, p;

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> v >> t >> p;
	v *= p+1;
	
	llint x = v / (t-1) * t;
	v %= (t-1);
	
	if(v >= 1){
		x++;
		x += v;
	}
	
	cout << x << endl;
	
	
	return 0;
}