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#include <iostream>
#include <string>
using namespace std;
int main()
{
int r,c;
char* row;
cin >> r;
cin >> c;
if(r < 1 || c < 1)
{
cout << 0 << endl;
return 0;
}
char num;
int count = 0;
for(int i = 0; i < r; i++)
{
if(!(i % 2))
{
for(int j = 0; j < c; j++)
{
cin >> num;
if(!(j % 2))
{
count += num-48;
}
}
}
else
{
for(int j = 0; j < c; j++)
{
cin >> num;
if(j % 2)
{
count += num-48;
}
}
}
}
/*for(int i = 0; i < r; i++)
{
row = new char[c];
for(int j = 0; j < c; j++)
{
row[j] = 0;
}
cin >> row;
if(cin.eof())
{
break;
}
for(int k = 0; k < c; k++)
{
count += row[k] - 48;
}
delete row;
}*/
cout << count << endl;
return 0;
}
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