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#include <bits/stdc++.h>

#include <iostream>

using namespace std;

int main(){

//program to find first row with max no of 1s if all rows are sorted and contain only 0 and 1 in O(m+n) time.

int m, n;

cin>>m>>n;

int arr[m][n];

for(int i=0;i<m;i++){

for(int j=0;j<n;j++)cin>>arr[i][j];

}

int ans = 0;

int j = n-1;

for(int i=0;i<m;i++){

while(j>=0 && arr[i][j]==1){

j--;

ans = i;

}

}

if(arr[ans][j+1]==0) cout<<-1;

cout<<ans<<endl;

return 0;

}