#include <atcoder/all>
#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace atcoder;
using namespace std;

typedef long long ll;

int binaryToInt(string s) {
    int res = 0;
    for (int i = 0; i < s.size(); i++) {
        res = res * 2 + (s[i] - '0');
    }
    return res;
}

int main() {
    int m, n;
    cin >> m >> n;
    vector<string> s(n);
    vector<int> a(n);
    set<int> st;
    vector<int> zero(m);
    rep(i, 0, n) {
        cin >> s[i];
        rep(j, 0, m) { zero[j] += s[i][j] == '0'; }
        a[i] = binaryToInt(s[i]);
        st.insert(a[i]);
    }
    int allzero = 0;
    rep(i, 0, m) {
        if (zero[i] == n) {
            allzero++;
        }
    }
    m -= allzero;
    if (st.size() == (1 << m) && m != 0) {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }
}