#include<cstdio>
#include<vector>
#include<iostream>
using namespace std;
const int N=1e5+10; bool vis[N]; vector<int>g[N];
int main() {
  //freopen("highway.in","r",stdin);
  //freopen("highway.out","w",stdout);
  int n,m,u,v; scanf("%d %d",&n,&m);
  while(m--) scanf("%d %d",&u,&v),g[min(u,v)].push_back(max(u,v));
  for(int i=n-1;i>=0;i--) for(auto j:g[i]) if(!vis[j]) vis[i]=true;
  for(int i=n-1;i>=0;i--) {
  	if(!vis[i]) continue;
  	for(int j=i;j>=0;j--) printf("%d",vis[j]);
  	break;
  }
  return 0;
}