#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define LONG_INF 100000000000000
int hoge[4] = {};
int main() {
	int n, m;
	cin >> n >> m;
	hoge[n] = true;
	REP(i, m) {
		int a, b;
		cin >> a >> b;
		swap(hoge[a], hoge[b]);
	}
	for (int i = 0;i < 4;++i) {
		if (hoge[i] == true) {
			cout << i << endl;
			return 0;
		}
	}
}