const lines = require('fs')
  .readFileSync('/dev/stdin', 'utf-8')
  .trim().split('\n').values();

const N = Number(lines.next().value);

let ans;

if (N % 2) {
  ans = '7' + '1'.repeat(N / 2 - 1);
} else {
  ans = '1'.repeat(N / 2);
}

console.log(ans);