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#include <iostream>

#include <queue>

#include <cstring>

#include <cstdio>

using namespace std;

const int maxn = 100;

bool g[maxn][maxn], visited[maxn];

int n;

queue<int> q;

void init(){

memset(g, false, sizeof(g));

memset(visited, false, sizeof(visited));

}

bool route(int src, int dst){

q.push(src);

visited[src] = true;

while(!q.empty()){

int t = q.front();

q.pop();

if(t == dst) return true;

for(int i=0; i<n; ++i)

if(g[t][i] && !visited[i]){

q.push(i);

visited[i] = true;

}

}

return false;

}

int main(){

freopen("4.2.in", "r", stdin);

init();

int m, u, v;

cin>>n>>m;

for(int i=0; i<m; ++i){

cin>>u>>v;

g[u][v] = true;

}

cout<<route(0, 6)<<endl;

fclose(stdin);

return 0;

}