/* -*- coding: utf-8 -*-
 *
 * 479.cc: No.479 頂点は要らない - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 100000;
const int MAX_M = 100000;

/* typedef */

typedef pair<int,int> pii;

/* global variables */

bool vs[MAX_N];
pii es[MAX_M];

/* subroutines */

/* main */

int main() {
  int n, m;
  cin >> n >> m;

  for (int i = 0; i < m; i++) {
    int a, b;
    cin >> a >> b;
    es[i] = pii(b, a);
  }
  sort(es, es + m, greater<pii>());

  for (int i = 0; i < m; i++) {
    int &bi = es[i].first, &ai = es[i].second;
    if (! vs[bi]) vs[ai] = true;
  }

  bool zf = false;
  for (int i = n - 1; i >= 0; i--) {
    if (vs[i] || zf) {
      printf("%d", vs[i]);
      zf = true;
    }
  }
  putchar('\n');
  return 0;
}