#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define MAXN 100000010
inline ll read(){
	ll x=0,f=1;
	char c=getchar();
	while(c<'0'||c>'9'){
		if(c=='-')f=-1;
		c=getchar();
	}
	while(c>='0'&&c<='9'){
		x=x*10+c-'0';
		c=getchar();
	}
	return x*f;
}
ll T,s[10],ans;
bool dp[10][MAXN];
int main(){
	freopen("fruitFeast.in","r",stdin);
	freopen("fruitFeast.out","w",stdout);
	T=read()*2,s[1]=read(),s[2]=read(),s[3]=s[1]*2,s[4]=s[2]*2;
	dp[0][0]=1;
	for(int i=1;i<=4;i++){
		for(int j=0;j<=T;j++){
			dp[i][j]=dp[i-1][j];
			if(j>=s[i])dp[i][j]|=dp[i-1][j-s[i]]|dp[i][j-s[i]];
		}
	}
	for(int i=T/2;i>=0;i--){
		if(dp[4][i]|dp[4][i*2]){
			cout<<i;
//			return 0;
			break;
		}
	}
	return 0;
}