#include <cstdio>

#define FOR(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define REV(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define INC0(i, n) FOR(i, 0, n)
#define INC1(i, n) FOR(i, 1, (n) + 1)
#define DEC0(i, n) REV(i, 0, n)
#define DEC1(i, n) REV(i, 1, (n) + 1)

typedef long long   signed int LL;
typedef long long unsigned int LU;


template<typename T> void swap(T& x, T& y) {
	T temp = x;
	x = y;
	y = temp;
	
	return;
}

int n, m;
int a[3];

int main() {
	scanf("%d%d", &n, &m); n--;
	a[n] = 1;
	
	INC0(i, m) {
		int p, q;
		scanf("%d%d", &p, &q); p--; q--;
		swap(a[p], a[q]);
	}
	
	int ans = (a[0] ? 0 : (a[1] ? 1 : 2) );
	
	printf("%d\n", ans + 1);
	
	return 0;
}