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#include "dzialka.h"
#include "message.h"

#include <stdio.h>

int main()
{
    if (MyNodeId() > 0)
        return 0;

    const int width = GetFieldWidth();
    const int height = GetFieldHeight();
    long long int sum = 0;
    for (int x = 0; x < width; ++x)
        for (int y = 0; y < height; ++y)
            if (IsUsableCell(y, x))
                sum++;
    printf("%lld\n", sum);
}