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#include <iostream>
using namespace std;

int main()
{
    int a, c =0;
    for(int i = 0; i <5 ; i++)
    {
        for(int b = 0; b <5 ; b++)
        {
            cin >> a;
            if (a == 1)
            {
                c++;
            }
        }

    }
    cout << c;
}