#include <bits/stdc++.h>

using namespace std;

typedef long long LL;

int main() {
    int n, c, v;
    cin >> n >> c >> v;

    int m = 0, p = 1;
    while (n > p) {
        m++;
        p *= 2;
    }

    int mn = 1000000000;
    p = 1;
    for (int i = 1; i <= m; i++) {
        int cost = (c + v) * i + v * ((n - p - 1) / p);
        mn = min(mn, cost);
        p *= 2;
    }

    cout << mn << endl;

    return 0;
}