#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define pii pair<int,int>
#define ft first
#define sd second
#define MP make_pair
#define all(x) x.begin(),x.end()
#define PB push_back
using namespace std;
typedef long long ll;
typedef long double ld;
const int N = 100100;
const ll OO = 1e18;
const ld E = 1e-9;
vector<int> g[N];
int n, m;
bool mrk[N];
void dfs(int v){
if (mrk[v]) return;
mrk[v] = 1;
for (int u : g[v])
dfs(u);
}
int main(){
ios_base::sync_with_stdio(0); cin.tie(0);
// freopen("in.txt","r",stdin);
cin >> n >> m;
for (int i = 0; i < m; i++){
int x, y; cin >> x >> y;
x--; y--;
g[y].PB(x);
}
if (sz(g[0]) == 0){
cout << 1;
for (int i = 1; i < n; i++)
cout << 0;
return 0;
}
for (int u : g[0])
dfs(u);
for (int i = 0; i < n; i++)
cout << mrk[i];
return 0;
}
