import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static Coupon[] coupons = new Coupon[3];
    static ArrayList<HashMap<Long, Long>> dp = new ArrayList<>();
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        long n = sc.nextLong();
        for (int i = 0; i < 3; i++) {
            coupons[i] = new Coupon(sc.nextInt(), sc.nextInt());
            dp.add(new HashMap<>());
        }
        Arrays.sort(coupons);
        long lcm = 1;
        for (Coupon x : coupons) {
            lcm = getLCM(x.count, lcm);
        }
        long max = 0;
        for (Coupon x : coupons) {
            max = Math.max(max, lcm / x.count * x.value);
        }
        long ans = n / lcm * max;
        n %= lcm;
        System.out.println(ans + dfw(2, n));
    }
    
    static long getLCM(long x, long y) {
        return x / getGCD(x, y) * y;
    }
    
    static long getGCD(long x, long y) {
        if (y == 0) {
            return x;
        } else {
            return getGCD(y, x % y);
        }
    }
     
    static long dfw(int idx, long v) {
        if (v < 0) {
            return Long.MIN_VALUE;
        }
        if (idx == 0) {
            return v / coupons[0].count * coupons[0].value;
        }
        if (!dp.get(idx).containsKey(v)) {
            dp.get(idx).put(v, Math.max(dfw(idx - 1, v), dfw(idx, v - coupons[idx].count) + coupons[idx].value));
        }
        return dp.get(idx).get(v);
    }
    
    static class Coupon implements Comparable<Coupon> {
        int count;
        int value;
        
        public Coupon(int count, int value) {
            this.count = count;
            this.value = value;
        }
        
        public int compareTo(Coupon another) {
            return count - another.count;
        }
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}