#include<bits/stdc++.h>using namespace std;#define pb push_back#define mp make_pair#define se second#define fs first#define LL long long#define CLR(x) memset(x,0,sizeof x)#define MC(x,y) memcpy(x,y,sizeof(x))  #define SZ(x) ((int)(x).size())#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin();it!=(c).end();it++)#define lson l,m,rt<<1#define rson m+1,r,rt<<1|1 typedef pair<int,int> P;const double eps=1e-9;const int maxn=200100;const int mod=1e9+7;const int INF=1e9;LL x,y,n;LL DP(int m){    if(m==0) return 0;    if(m==1) return x;    if(m&1) return min(DP(m-1),DP(m+1))+x;    return DP(m/2)+min(x*m/2,y);}int main(){    cin>>n>>x>>y;    cout<<DP(n)<<endl;}