#include <iostream>
using namespace std;
int main() {
int n,m,i,j,x=0,a[10][10];
cin>>n>>m;
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
{
cin>>a[i][j];
}
}
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
{
x^=a[i][j];
}
}
cout<<x;
// your code goes here
return 0;
}
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