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#include <iostream>
#include <fstream>
using namespace std;
int n,m,s,i,j,a[5000][5000];
bool v[5000];
ifstream f("dfs.in");
ofstream g("dfs.out");
void parcurgerea(int i)
{
v[i]=true;
for (j=1;j<=m;j++)
if ((a[i][j]==1)&&(v[j]==false))
{
parcurgerea (j);
}
}
int main()
{
f>>n>>m;
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
f>>a[i][j];
for (i=1;i<=n;i++)
{
if (v[i]==false)
s++;
parcurgerea (i);
}
g<<s;
return 0;
}