//No.26 シャッフルゲーム
#include <stdio.h>

int main()
{
    int N, M;
    int c[3] = {0, 0, 0};
    scanf("%d", &N);
    scanf("%d", &M);
    c[N-1] = 1;
    
    int P[M], Q[M];
    for(int i=0; i<M; i++){
        scanf("%d %d", &P[i], &Q[i]);
        int tmp = c[P[i]-1];
        c[P[i]-1] = c[Q[i]-1];
        c[Q[i]-1] = tmp;
    }
    
    for(int i=0; i<3; i++){
        if(c[i] == 1){
            printf("%d\n", i+1);
            break;
        }
    }

    return 0;
}