function main(input) {
  const N = parseInt(input.trim());
  if (N == 2) {
  	console.log("1");
  	return;
  } else if (N == 3) {
  	console.log("7");
  	return;
  }
  if (N % 2 == 0) {
  	const M = N / 2;
  	let ans = "";
  	for (let i = 0; i < M; i++) {
  	  ans += "1";
  	}
  	console.log(ans);
  	return;
  } else {
  	const M = (N - 3) / 2;
  	let ans = "7";
  	for (let i = 0; i < M; i++) {
  	  ans += "1";
  	}
  	console.log(ans);
  	return;
  }
}

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