#include <cmath>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <functional>
#include <queue>
#include <iostream>
#include <string.h>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <cstdint>
#include <climits>
#include <unordered_set>
#include <sstream>
#include <stack>

using namespace std;

typedef long long int ll;
typedef pair<int,int> pii;
typedef tuple<int,int,int> t3;

ll dp[100010];

int main()
{
    int n, c, v;
    cin >> n >> c >> v;
    fill(dp, dp + 100010, 1e7);
    dp[0] = 0;
    dp[1] = 0;
    dp[2] = c + v;
    for(int i = 3;i < 2 * n;i++)
    {
        dp[i] = dp[1] + c + v * (i-1);
        for(int j = 2;j < sqrt(i) + 1;j++)
        {
            if(i % j == 0)
            {
                dp[i] = min(dp[i], dp[j] + c + v * ((i-1) / j));
            }
        }
    }
    ll m = 1e10;
    for(int i = n;i <= 2 * n;i++)
    {
        m = min(m, dp[i]);
    }
    cout << m << endl;
    return 0;
}