#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <math.h>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <stack>
#include <queue>

typedef unsigned long long ULLONG;
typedef long long LLONG;
static const LLONG MOD_NUM = 1000000007;//998244353;

template<class _T> static void getval(_T& a) {
	std::cin >> a;
}
template<class _T> static void getval(_T& a, _T& b) {
	std::cin >> a >> b;
}
template<class _T> static void getval(_T& a, _T& b, _T& c) {
	std::cin >> a >> b >> c;
}

static void exec();

int main()
{
	exec();
	fflush(stdout);
	return 0;
}

static void exec()
{
	LLONG V, T, P;
	getval(V, T, P);
	
	if (P) {
		V = V * (P + 1);
	}
	LLONG rd = V / T;
	LLONG rdtmp = (rd + V % T) / T;
	rd += rdtmp;
	while (rdtmp) {
		rdtmp = (rdtmp + rdtmp % T) / T;
		rd += rdtmp;
	}

	LLONG ans = V + rd + 1;

	printf("%lld\n", ans);
}