#include <bits/stdc++.h>
#include <atcoder/all>

typedef unsigned long long ULLONG;
typedef long long LLONG;
static const LLONG MOD_NUM = 998244353LL;//1000000007LL
static const LLONG INF_NUM = MOD_NUM * 20LL;
template<class _T> static void get(_T& a) {
	std::cin >> a;
}
template<class _T> static void get(_T& a, _T& b) {
	std::cin >> a >> b;
}
template<class _T> static void get(_T& a, _T& b, _T& c) {
	std::cin >> a >> b >> c;
}
template <class _T> static _T tp_abs(_T a) {
	if (a < (_T)0) {
		a *= (_T)-1;
	}
	return a;
}
template <class _T> static _T tp_pow(int x, int exp)
{
	_T ans = 1;
	_T base = x;
	while (exp > 0) {
		if (exp & 1) {
			ans = (ans * base);
		}
		base = (base * base);
		exp >>= 1;
	}
	return ans;
}

static void task();
template <class _T> static _T tp_modpow(_T x, _T exp, _T mod = (_T)1) {
	_T ans = 1;
	_T base = x;
	while (exp > 0) {
		if (exp & (_T)1) {
			ans = (ans * base) % mod;
		}
		base = (base * base) % mod;
		exp >>= (_T)1;
	}
	return ans;
}

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

static void task()
{
	LLONG D, A, B;
	get(D, A, B);

	LLONG min = MOD_NUM;
	for (LLONG d = 0; d <= D; d++) {
		min = std::min(min, d * A + (D - d) * B);
	}
	printf("%lld\n", min);
}