#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001
long long N,A,B;
long long get(long long X){
	long long Y = N-X;
	long long ret = (X-Y) * B;
	if(X==0||Y==0){
		ret += (N-1) * A;
	}
	else if(X==Y){
		ret -= (N-1) * A;
	}
	else{
		long long t = min(X,Y);
		ret -= (t+1) * A;
		ret += (N-1-(t+1)) * A;
	}
	return ret;
}
int main() {
	
	
	cin>>N>>A>>B;
	
	long long l = 0,r = N/2;
		
	while(r-l>=3){
		long long m0 = l + (r-l)/3;
		long long m1 = m0 + (r-l)/3;
		if(get(m0)>get(m1))l = m0;
		else r = m1;
	}
	long long ans = Inf64;
	for(long long i=l;i<=r;i++){
		//cout<<i<<endl;
		ans = min(ans,get(i));
	}
	for(long long i=0;i<=min(1000LL,N/2);i++)ans = min(ans,get(i));
	for(long long i=0;i<=min(1000LL,N/2);i++)ans = min(ans,get(N-i));
	for(long long i=0;i<=min(1000LL,N/2);i++)ans = min(ans,get(N/2-i));
	for(long long i=0;i<=min(1000LL,N/2);i++)ans = min(ans,get(N/2+i));

	
	cout<<ans<<endl;
	
    return 0;
}