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#include <bits/stdc++.h>
using namespace std;
const int N = 110;
char a[N][N];
#define x first
#define y second
typedef pair<int, int> PII;
int dx[] = {-1, 0, 1, 0}; //上右下左
int dy[] = {0, 1, 0, -1}; //上右下左
int main() {
int n, m;
cin >> n >> m;
for (int i = 1; i <= n; i++)
for (int j = 1; j <= m; j++)
cin >> a[i][j];
queue<PII> q;
q.push({1, 1});
while (q.size()) {
auto t = q.front();
q.pop();
for (int i = 0; i < 4; i++) {
int tx = t.x + dx[i], ty = t.y + dy[i];
if (tx == 0 || tx > n || ty == 0 || ty > m) continue;
if (a[tx][ty] == '0') {
a[tx][ty] = 'x';
q.push({tx, ty});
}
}
}
if (a[n][m] == 'x')
cout << "yes" << endl;
else
cout << "no" << endl;
return 0;
}