function main(input) {
  const N = parseInt(input.trim());
  if (N == 2) {
  	return "1";
  } else if (N == 3) {
  	return "7";
  }
  if (N % 2 == 0) {
  	return "1".repeat(N / 2);
  } else {
  	return "7" + "1".repeat((N - 3) / 2);
  }
}

// Don't edit this line!
console.log(main(require("fs").readFileSync("/dev/stdin", "utf8")));