import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }




void main() {
  try {
    for (; ; ) {
      const H = readLong;
      const W = readLong;
      const LA = readLong;
      const LB = readLong;
      const KA = readLong;
      const KB = readLong;
      
      bool check(long a, long b) {
        const h = max(H - LA * a, 0);
        const w = max(W - LB * b, 0);
        const both = KA * a + KB * b;
        return (H * W - (H-h) * (W-w) <= both);
      }
      
      long ans = H + W;
      {
        long b = H + W;
        foreach (a; 0 .. (H + W) + 1) {
          for (; b >= 0 && check(a, b); --b) {
            chmin(ans, a + b);
          }
        }
      }
      writeln(ans);
    }
  } catch (EOFException e) {
  }
}