import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.Serializable;
import java.util.Iterator;
import java.util.Locale;
import java.util.NoSuchElementException;

public class Main {

	public static void main(String[] args) {
		new Main();
	}

	public Main() {
		FastIO io = new FastIO();
		/*
		 * author: 31536000
		 * diverta2019-2 D問題
		 * 考察メモ
		 * 1. 最後はドングリへの変換以外行わない
		 * 2. ドングリの割り振りはともかく、それ以外はとりあえず独立に考えていい
		 * さて、gA > gBとする
		 * 明らかに、Bの取引所でドングリ→金にして、Aで金→ドングリにするのが最適
		 * 次にgA < gBとする
		 * 明らかに、Aの取引所で金→ドングリにして、Bで金→ドングリにするのが最適
		 * また、Bではいったん全てをドングリに変換しても問題は無い
		 * よって、各取引所では次の取引所で受け取れるだろうドングリ数を最大化すれば良い
		 *
		 */
		int N = io.nextInt(), metalA[] = io.nextInt(3), metalB[] = io.nextInt(3);
		int cngA = 0;
		for (int i = 0;i < 3;++ i) if (metalA[i] < metalB[i]) ++ cngA;
		long ans = N;
		switch(cngA) {
			case 0: // B→Aのみ考えれば良い、これは可能
				for (int i = 0;i <= N;++ i) {
					for (int j = 0;j <= N - metalB[0] * i;++ j) {
						int k = (N - metalB[0] * i - metalB[1] * j) / metalB[2];
						if (N - metalB[0] * i - metalB[1] * j < 0) continue; // ここまででi, j, kがそれぞれの金属の購入数
						ans = Math.max(ans, N + (metalA[0] - metalB[0]) * i + (metalA[1] - metalB[1]) * j + (metalA[2] - metalB[2]) * k);
					}
				}
				break;
			case 1: // 何か1個だけA→Bで換金して増やしたっぽい、これもB→Aは調べられるの
				int a1 = 0, a2 = 0; // B→Aを行った場所
				if (metalA[0] <= metalB[0]) {
					a1 = 1;
					a2 = 2;
					N = N % metalA[0] + N / metalA[0] * metalB[0];
				} else if (metalA[1] <= metalB[1]) {
					a1 = 0;
					a2 = 2;
					N = N % metalA[1] + N / metalA[1] * metalB[1];
				} else if (metalA[2] <= metalB[2]) {
					a1 = 0;
					a2 = 1;
					N = N % metalA[2] + N / metalA[2] * metalB[2];
				}
				for (long i = 0;i <= N;++ i) { // 注意:5000^3はlongの範囲
					long j = (N - metalB[a1] * i) / metalB[a2];
					if (N - metalB[a1] * i < 0) break;
					ans = Math.max(ans, N + (metalA[a1] - metalB[a1]) * i + (metalA[a2] - metalB[a2]) * j);
				}
				break;
			case 2: // 要はA→Bで殆ど増やした、全探索やね(処理纏めたいので後で場合分け
			case 3: // A→Bで全部増やした、これも全探索
				for (int i = 0;i <= N;++ i) {
					for (int j = 0;j <= N - metalA[0] * i;++ j) {
						int k = (N - metalA[0] * i - metalA[1] * j) / metalA[2];
						if (metalA[2] > metalB[2]) k = 0; // 交換すると損ならしない～
						if (N - metalA[0] * i - metalA[1] * j < 0) continue; // ここまででi, j, kがそれぞれの金属の購入数
						ans = Math.max(ans, N + (metalB[0] - metalA[0]) * i + (metalB[1] - metalA[1]) * j + (metalB[2] - metalA[2]) * k);
					}
				}
				break;
		}
		if (cngA == 2) { // 最後の交換フェーズ
			for (int i = 0;i < 3;++ i) {
				if (metalA[i] > metalB[i]) {
					ans = ans % metalB[i] + ans / metalB[i] * metalA[i];
				}
			}
		}
		io.print(ans);
		io.flush();
	}

	public class FastIO {
		private final InputStream in = System.in;
		private final byte[] buffer = new byte[1024];
		private int read = 0;
		private int length = 0;
		public final PrintWriter out = new PrintWriter(System.out, false);
		public final PrintWriter err = new PrintWriter(System.err, false);

		private boolean hasNextByte() {
			if (read < length) return true;
			read = 0;
			try {
				length = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			return length > 0;
		}

		private int readByte() {
			return hasNextByte() ? buffer[read++] : -1;
		}

		private boolean isPrintableChar(int c) {
			return 33 <= c && c <= 126;
		}

		private boolean isNumber(int c) {
			return '0' <= c && c <= '9';
		}

		public boolean hasNext() {
			while (hasNextByte() && !isPrintableChar(buffer[read])) read++;
			return hasNextByte();
		}

		public char nextChar() {
			if (!hasNextByte())  throw new NoSuchElementException();
			return (char)readByte();
		}

		public char[][] nextChar(int height) {
			char[][] ret = new char[height][];
			for (int i = 0;i < ret.length;++ i) ret[i] = next().toCharArray();
			return ret;
		}

		public String next() {
			if (!hasNext()) throw new NoSuchElementException();
			StringBuilder sb = new StringBuilder();
			int b;
			while (isPrintableChar(b = readByte())) sb.appendCodePoint(b);
			return sb.toString();
		}

		public long nextLong() {
			if (!hasNext()) throw new NoSuchElementException();
			long n = 0;
			boolean minus = false;
			int b = readByte();
			if (b == '-') {
				minus = true;
				b = readByte();
			}
			if (!isNumber(b)) throw new NumberFormatException();
			while (true) {
				if (isNumber(b)) {
					n *= 10;
					n += b - '0';
				} else if (b == -1 || !isPrintableChar(b)) return minus ? -n : n;
				else throw new NumberFormatException();
				b = readByte();
			}
		}

		public int nextInt() {
			long nl = nextLong();
			if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
			return (int) nl;
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}

		public int[] nextInt(int width) {
			int[] ret = new int[width];
			for (int i = 0;i < width;++ i) ret[i] = nextInt();
			return ret;
		}

		public long[] nextLong(int width) {
			long[] ret = new long[width];
			for (int i = 0;i < width;++ i) ret[i] = nextLong();
			return ret;
		}

		public int[][] nextInt(int width, int height) {
			int[][] ret = new int[height][width];
			for (int i = 0, j;i < height;++ i) for (j = 0;j < width;++ j) ret[i][j] = nextInt();
			return ret;
		}

		public long[][] nextLong(int width, int height) {
			long[][] ret = new long[height][width];
			for (int i = 0, j;i < height;++ i) for (j = 0;j < width;++ j) ret[j][i] = nextLong();
			return ret;
		}

		public boolean[] nextBoolean(char T) {
			char[] s = next().toCharArray();
			boolean[] ret = new boolean[s.length];
			for (int i = 0;i < ret.length;++ i) ret[i] = s[i] == T;
			return ret;
		}

		public boolean[][] nextBoolean(char T, int height) {
			boolean[][] ret = new boolean[height][];
			for (int i = 0;i < ret.length;++ i) {
				char[] s = next().toCharArray();
				ret[i] = new boolean[s.length];
				for (int j = 0;j < ret[i].length;++ j) ret[i][j] = s[j] == T;
			}
			return ret;
		}

		@Override
		protected void finalize() throws Throwable {
			try {
				super.finalize();
			} finally {
				in.close();
				out.close();
				err.close();
			}
		}

		public void print(boolean b) {
			out.print(b);
		}

		public void print(char c) {
			out.print(c);
		}

		public void print(char[] s) {
			out.print(s);
		}

		public void print(double d) {
			out.print(d);
		}

		public void print(float f) {
			out.print(f);
		}

		public void print(int i) {
			out.print(i);
		}

		public void print(long l) {
			out.print(l);
		}

		public void print(Object obj) {
			out.print(obj);
		}

		public void print(String s) {
			out.print(s);
		}

		public void printf(String format, Object... args) {
			out.printf(format, args);
		}

		public void printf(Locale l, String format, Object... args) {
			out.printf(l, format, args);
		}

		public void println() {
			out.println();
		}

		public void println(boolean b) {
			out.println(b);
		}

		public void println(char c) {
			out.println(c);
		}

		public void println(char[] s) {
			out.println(s);
		}

		public void println(double d) {
			out.println(d);
		}

		public void println(float f) {
			out.println(f);
		}

		public void println(int i) {
			out.println(i);
		}

		public void println(long l) {
			out.println(l);
		}

		public void println(Object obj) {
			out.println(obj);
		}

		public void println(String s) {
			out.println(s);
		}

		public void flush() {
			out.flush();
			err.flush();
		}
	}
	public enum BoundType {
		CLOSED, OPEN;
	}

	public static class Range<C extends Comparable<? super C>> implements Serializable{

		private static final long serialVersionUID = 6582232757238309626L;
		protected C lower;
		protected C upper;
		protected BoundType lowerType;
		protected BoundType upperType;

		protected Range(C lower, BoundType lowerType, C upper, BoundType upperType) {
			this.lower = lower;
			this.upper = upper;
			this.lowerType = lowerType;
			this.upperType = upperType;
		}

		public static <C extends Comparable<? super C>> Range<C> range(C lower, BoundType lowerType, C upper, BoundType upperType) {
			if (lower != null && upper != null) {
				int comp = lower.compareTo(upper);
				if (comp > 0) throw new IllegalArgumentException();
				else if (comp == 0) {
					if (lowerType == BoundType.OPEN && upperType == BoundType.OPEN) throw new IllegalArgumentException();
					else if (lowerType == BoundType.OPEN || upperType == BoundType.OPEN)return new Range<C>(null, BoundType.CLOSED, null, BoundType.CLOSED);
				}
			}
			return new Range<C>(lower, lowerType, upper, upperType);
		}

		public static <C extends Comparable<? super C>> Range<C> all() {
			return range(null, BoundType.OPEN, null, BoundType.OPEN);
		}

		public static <C extends Comparable<? super C>> Range<C> atMost(C upper) {
			return range(null, BoundType.OPEN, upper, BoundType.CLOSED);
		}

		public static <C extends Comparable<? super C>> Range<C> lessThan(C upper) {
			return range(null, BoundType.OPEN, upper, BoundType.OPEN);
		}

		public static <C extends Comparable<? super C>> Range<C> downTo(C upper, BoundType boundType) {
			return range(null, BoundType.OPEN, upper, boundType);
		}

		public static <C extends Comparable<? super C>> Range<C> atLeast(C lower) {
			return range(lower, BoundType.CLOSED, null, BoundType.OPEN);
		}

		public static <C extends Comparable<? super C>> Range<C> greaterThan(C lower) {
			return range(lower, BoundType.OPEN, null, BoundType.OPEN);
		}

		public static <C extends Comparable<? super C>> Range<C> upTo(C lower, BoundType boundType) {
			return range(lower, boundType, null, BoundType.OPEN);
		}

		public static <C extends Comparable<? super C>> Range<C> open(C lower, C upper) {
			return range(lower, BoundType.OPEN, upper, BoundType.OPEN);
		}

		public static <C extends Comparable<? super C>> Range<C> openClosed(C lower, C upper) {
			return range(lower, BoundType.OPEN, upper, BoundType.CLOSED);
		}

		public static <C extends Comparable<? super C>> Range<C> closedOpen(C lower, C upper) {
			return range(lower, BoundType.CLOSED, upper, BoundType.OPEN);
		}

		public static <C extends Comparable<? super C>> Range<C> closed(C lower, C upper) {
			return range(lower, BoundType.CLOSED, upper, BoundType.CLOSED);
		}

		public static <C extends Comparable<? super C>> Range<C> singleton(C value) {
			return range(value, BoundType.CLOSED, value, BoundType.CLOSED);
		}

		public static <C extends Comparable<? super C>> Range<C> empty() {
			return range(null, BoundType.CLOSED, null, BoundType.CLOSED);
		}

		public static <C extends Comparable<? super C>> Range<C> encloseAll(Iterable<C> values) {
			C lower = values.iterator().next();
			C upper = lower;
			for (C i : values) {
				if (lower.compareTo(i) > 0) lower = i;
				if (upper.compareTo(i) < 0) upper = i;
			}
			return range(lower, BoundType.CLOSED, upper, BoundType.CLOSED);
		}

		public boolean hasLowerBound() {
			return lower != null;
		}

		public C lowerEndpoint() {
			if (hasLowerBound()) return lower;
			throw new IllegalStateException();
		}

		public BoundType lowerBoundType() {
			if (hasLowerBound()) return lowerType;
			throw new IllegalStateException();
		}

		public boolean hasUpperBound() {
			return upper != null;
		}

		public C upperEndpoint() {
			if (hasUpperBound()) return upper;
			throw new IllegalStateException();
		}

		public BoundType upperBoundType() {
			if (hasUpperBound()) return upperType;
			throw new IllegalStateException();
		}

		/**
		 * この区間が空集合か判定します。
		 * @return 空集合ならばtrue
		 */
		public boolean isEmpty() {
			return lower == null && upper == null && lowerType == BoundType.CLOSED;
		}

		/**
		 * 与えられた引数が区間の左側に位置するか判定します。<br>
		 * 接する場合は区間の左側ではないと判定します。
		 * @param value 調べる引数
		 * @return 区間の左側に位置するならtrue
		 */
		public boolean isLess(C value) {
			return isLess(value, BoundType.CLOSED);
		}

		private boolean isLess(C value, BoundType boundType) {
			if (lower == null || value == null) return false;
			if (lowerType == BoundType.CLOSED && boundType == BoundType.CLOSED) return lower.compareTo(value) > 0;
			return lower.compareTo(value) >= 0;
		}

		/**
		 * 与えられた引数が区間の右側に位置するか判定します。<br>
		 * 接する場合は区間の右側ではないと判定します。
		 * @param value 調べる引数
		 * @return 区間の右側に位置するならtrue
		 */
		public boolean isGreater(C value) {
			return isGreater(value, BoundType.CLOSED);
		}

		private boolean isGreater(C value, BoundType boundType) {
			if (upper == null || value == null) return false;
			if (upperType == BoundType.CLOSED && boundType == BoundType.CLOSED)return upper.compareTo(value) < 0;
			return upper.compareTo(value) <= 0;
		}

		/**
		 * 与えられた引数が区間内に位置するか判定します。<br>
		 * 接する場合も区間内に位置すると判定します。
		 * @param value 調べる引数
		 * @return 区間内に位置するならtrue
		 */
		public boolean contains(C value) {
			return !isLess(value) && !isGreater(value) && !isEmpty();
		}

		/**
		 * 与えられた引数すべてが区間内に位置するか判定します。<br>
		 * 接する場合も区間内に位置すると判定します。
		 * @param value 調べる要素
		 * @return 全ての要素が区間内に位置するならtrue
		 */
		public boolean containsAll(Iterable<? extends C> values) {
			for (C i : values) if (!contains(i)) return false;
			return true;
		}

		/**
		 * 与えられた区間がこの区間に内包されるか判定します。<br>
		 *
		 * @param other
		 * @return 与えられた区間がこの区間に内包されるならtrue
		 */
		public boolean encloses(Range<C> other) {
			return !isLess(other.lower, other.lowerType) && !isGreater(other.upper, other.upperType);
		}

		/**
		 * 与えられた区間がこの区間と公差するか判定します。<br>
		 * 接する場合は公差するものとします。
		 * @param value 調べる引数
		 * @return 区間が交差するならtrue
		 */
		public boolean isConnected(Range<C> other) {
			C lower, upper;
			BoundType lowerType, upperType;
			if (isLess(other.lower, other.lowerType)) {
				lower = other.lower;
				lowerType = other.lowerType;
			} else {
				lower = this.lower;
				lowerType = this.lowerType;
			}
			if (isGreater(other.upper, other.upperType)) {
				upper = other.upper;
				upperType = other.upperType;
			} else {
				upper = this.upper;
				upperType = this.upperType;
			}
			if (lower == null || upper == null) return true;
			int comp = lower.compareTo(upper);
			if (comp < 0) return true;
			else if (comp > 0) return false;
			return lowerType == BoundType.CLOSED || upperType == BoundType.CLOSED;
		}

		/**
		 * この区間との積集合を返します。
		 * @param connectedRange 積集合を求める区間
		 * @return 積集合
		 */
		public Range<C> intersection(Range<C> connectedRange) {
			if (!isConnected(connectedRange)) throw new IllegalArgumentException();
			C lower, upper;
			BoundType lowerType, upperType;
			if (isLess(connectedRange.lower, connectedRange.lowerType)) {
				lower = connectedRange.lower;
				lowerType = connectedRange.lowerType;
			} else {
				lower = this.lower;
				lowerType = this.lowerType;
			}
			if (isGreater(connectedRange.upper, connectedRange.upperType)) {
				upper = connectedRange.upper;
				upperType = connectedRange.upperType;
			} else {
				upper = this.upper;
				upperType = this.upperType;
			}
			return range(lower, lowerType, upper, upperType);
		}

		/**
		 * この区間との和集合を返します。
		 * @param other 和集合を求める区間
		 * @return 和集合
		 */
		public Range<C> span(Range<C> other) {
			if (other.isEmpty()) return range(lower, lowerType, upper, upperType);
			C lower, upper;
			BoundType lowerType, upperType;
			if (isLess(other.lower, other.lowerType)) {
				lower = this.lower;
				lowerType = this.lowerType;
			} else {
				lower = other.lower;
				lowerType = other.lowerType;
			}
			if (isGreater(other.upper, other.upperType)) {
				upper = this.upper;
				upperType = this.upperType;
			} else {
				upper = other.upper;
				upperType = other.upperType;
			}
			return range(lower, lowerType, upper, upperType);
		}

		@Override
		public boolean equals(Object object) {
			if (this == object) return true;
			if (object instanceof Range) {
				@SuppressWarnings("unchecked")
				Range<C> comp = (Range<C>) object;
				return lower.compareTo(comp.lower) == 0 && upper.compareTo(comp.upper) == 0 && lowerType == comp.lowerType && upperType == comp.upperType;
			}
			return false;
		}

		@Override
		public int hashCode() {
			if (lower == null && upper == null) return 0;
			else if (lower == null) return upper.hashCode();
			else if (upper == null) return lower.hashCode();
			return lower.hashCode() ^ upper.hashCode();
		}

		@Override
		public String toString() {
			if (isEmpty()) return "()";
			return (lowerType == BoundType.OPEN ? "(" : "[") + (lower == null ? "" : lower.toString()) + ".." + (upper == null ? "" : upper.toString()) + (upperType == BoundType.OPEN ? ")" : "]");
		}
	}

	public interface IterableFunction<T> {
		public T next(T value);
	}

	public static class IterableRange<C extends Comparable<? super C>> extends Range<C> implements Iterable<C>{

		private static final long serialVersionUID = -8258795284144976352L;
		protected IterableFunction<C> func;

		protected IterableRange(C lower, BoundType lowerType, C upper, BoundType upperType, IterableFunction<C> func) {
			super(lower, lowerType, upper, upperType);
			this.func = func;
		}

		public static <C extends Comparable<? super C>> IterableRange<C> range(C lower, BoundType lowerType, C upper, BoundType upperType, IterableFunction<C> func) {
			if (lower == null || upper == null) throw new IllegalArgumentException();
			int comp = lower.compareTo(upper);
			if (comp > 0) throw new IllegalArgumentException();
			else if (comp == 0 && (lowerType == BoundType.OPEN || upperType == BoundType.OPEN)) throw new IllegalArgumentException();
			return new IterableRange<C>(lower, lowerType, upper, upperType, func);
		}

		public static <C extends Comparable<? super C>> IterableRange<C> open(C lower, C upper, IterableFunction<C> func) {
			if (lower == null) throw new IllegalArgumentException();
			return range(func.next(lower), BoundType.CLOSED, upper, BoundType.OPEN, func);
		}

		public static <C extends Comparable<? super C>> IterableRange<C> openClosed(C lower, C upper, IterableFunction<C> func) {
			if (lower == null) throw new IllegalArgumentException();
			return range(func.next(lower), BoundType.CLOSED, upper, BoundType.CLOSED, func);
		}

		public static <C extends Comparable<? super C>> IterableRange<C> closedOpen(C lower, C upper, IterableFunction<C> func) {
			return range(lower, BoundType.CLOSED, upper, BoundType.OPEN, func);
		}

		public static <C extends Comparable<? super C>> IterableRange<C> closed(C lower, C upper, IterableFunction<C> func) {
			return range(lower, BoundType.CLOSED, upper, BoundType.CLOSED, func);
		}

		public static <C extends Comparable<? super C>> IterableRange<C> singleton(C value, IterableFunction<C> func) {
			return range(value, BoundType.CLOSED, value, BoundType.CLOSED, func);
		}

		private class Iter implements Iterator<C> {
			C now;
			Iter() {
				now = lower;
			}
			@Override
			public boolean hasNext() {
				return !isGreater(now);
			}

			@Override
			public C next() {
				C ret = now;
				now = func.next(now);
				return ret;
			}
		}

		@Override
		public Iterator<C> iterator() {
			return new Iter();
		}
	}

	public static class IntRange extends IterableRange<Integer>{

		private static final long serialVersionUID = 1384105098345065693L;

		protected IntRange(int lower, BoundType lowerType, int upper, BoundType upperType) {
			super(lower, lowerType, upper, upperType, i -> i + 1);
		}

		public static IntRange range(int lower, BoundType lowerType, int upper, BoundType upperType) {
			if (lower > upper) return new IntRange(0, BoundType.CLOSED, -1, BoundType.CLOSED);
			if (lowerType == BoundType.OPEN) ++ lower;
			if (upperType == BoundType.OPEN) -- upper;
			return new IntRange(lower, BoundType.CLOSED, upper, BoundType.CLOSED);
		}

		public static IntRange open(int lower, int upper) {
			return range(lower, BoundType.OPEN, upper, BoundType.OPEN);
		}

		public static IntRange open(int upper) {
			return range(0, BoundType.CLOSED, upper, BoundType.OPEN);
		}

		public static IntRange openClosed(int lower, int upper) {
			return range(lower, BoundType.OPEN, upper, BoundType.CLOSED);
		}

		public static IntRange closedOpen(int lower, int upper) {
			return range(lower, BoundType.CLOSED, upper, BoundType.OPEN);
		}

		public static IntRange closed(int lower, int upper) {
			return range(lower, BoundType.CLOSED, upper, BoundType.CLOSED);
		}

		public static IntRange closed(int upper) {
			return range(0, BoundType.CLOSED, upper, BoundType.CLOSED);
		}

		public static IntRange singleton(int value) {
			return range(value, BoundType.CLOSED, value, BoundType.CLOSED);
		}

		private class Iter implements Iterator<Integer> {
			int now;
			Iter() {
				now = lower;
			}
			@Override
			public boolean hasNext() {
				return now <= upper;
			}

			@Override
			public Integer next() {
				return now++;
			}
		}

		@Override
		public Iterator<Integer> iterator() {
			return new Iter();
		}
	}
}


Measured memory_bytes: 23380