#include <iostream>
#include <cstdlib>
using namespace std;
int quick_power (int a, int n)
{
    int r=1;
    while (n>0)
    {
        if (n%2==1)
        {
            r*=a;
            n--;
        }
        a*=a;
        n/=2;
    }
    return r;
}
int main()
{
    int n,m,c,i,j,x1,x2,xm,s,d,ch,ch1=0;
    cin >> n >> m;
    int a[2*n][2*n], b[n];
    for (i=0;i<2*n;i++)
    {
        for (j=0;j<2*n;j++)
        {
            a[i][j]=0;
        }
    }
    for (j=0;j<n;j++)
    {
        b[j]=quick_power(2,j);
    }
    s=quick_power(2,n);
    for (i=0;i<m;i++)
    {
        cin >> x1 >> x2;
        xm=min(x1,x2);
        x1=max(x1,x2);
        if (xm<0)
            xm=xm+n;
        else
            xm=xm+n-1;
        if (x1<0)
            x1=x1+n;
        else
            x1=x1+n-1;
        a[xm][x1]=1;
    }
    for (i=0;i<s;i++)
    {
        ch=0;
            for (c=0;c<2*n;c++)
            {
                if (ch==0)
                {
                    for (d=c;d<2*n;d++)
                    {
                        if (d+c!=2*n-1 && a[c][d]==1)
                        {
                            if (c<n)
                            {
                                x1=(i/b[n-c-1]+1)%2;
                            }
                            else
                            {
                                x1=(i/b[c-n])%2;
                            }
                            if (d<n)
                            {
                                x2=(i/b[n-d-1]+1)%2;
                            }
                            else
                            {
                                x2=(i/b[d-n])%2;
                            }
                            if (x1==0 && x2==0)
                            {
                                ch=1;
                                break;
                            }

                        }
                    }
                }
            }
            if (c==2*n && d==2*n)
            {
                ch1=1;
                break;
            }
    }
    if (ch1==1)
        cout << "NO" << endl;
    else
        cout << "YES" << endl;
    return 0;
}