let l = require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n");
let n = BigInt(l[0]);
let [a0, b0] = l[1].split(" ").map(s => BigInt(s));
let [a1, b1] = l[2].split(" ").map(s => BigInt(s));
let [a2, b2] = l[3].split(" ").map(s => BigInt(s));

if (a1*b2<a2*b1){
  [a1,b1,a2,b2]=[a2,b2,a1,b1];
}
if (a0*b2<a2*b0){
  [a0,b0,a2,b2]=[a2,b2,a0,b0];
}

function solve(n, ap, bp, aq, bq, ar, br) {
  let r = 0n, imax = ap * bq, jmax = ap * br;
  for (let i = 0n, di = n; i < imax && di >= 0n; i += bq, di -= aq) {
      for (let j = 0n, dj = di; j < jmax && dj >= 0n; j += br, dj -= ar) {
        let t = dj / ap * bp + i + j;
        r = (r < t) ? t : r;
    }
  }
  return r;
}

let r = solve(n, a2, b2, a0, b0, a1, b1);
console.log(r.toString());