#include <bits/stdc++.h>

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,a) FOR(i,0,a)

using namespace std;

const int MAX_N=50000;

int N;
int C,V;

int dp[MAX_N*2-1];

void solve(){
  dp[1]=0;
  FOR(i,2,2*N-1){
    dp[i]=C+(i-1)*V;
    for(int j=2;j*j<=i;j++){
      if (i%j==0){
	dp[i]=min(dp[i],dp[j]+C+(i/j-1)*V);
	dp[i]=min(dp[i],dp[i/j]+C+(j-1)*V);
      }
    }
  }
  int ans=dp[N];
  FOR(i,N+1,2*N-1){
    ans=min(ans,dp[i]);
  }
  cout<<ans<<endl;
}

int main(){
  cin>>N;
  cin>>C>>V;
  solve();
  return 0;
}