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#include <bits/stdc++.h>
using namespace std;

#define PII pair<int, int>
#define VI vector<int>
#define VPII vector<PII>
#define LL long long
#define LD long double
#define f first
#define s second
#define MP make_pair
#define PB push_back
#define endl '\n'
#define ALL(c) (c).begin(), (c).end()
#define SIZ(c) (int)(c).size()
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define FOR(i, b, e) for (int i = (b); i <= (int)(e); i++)
#define FORD(i, b, e) for (int i = (b); i >= (int)(e); i--)
#define ll long long
#define st f
#define nd s
#define pb PB
#define eb emplace_back
#define mp make_pair
const int inf = 1e9 + 7;
const LL INF = 1e18L + 7;

#define sim template<class n
sim, class s> ostream & operator << (ostream &p, pair<n, s> x)
{return p << "<" << x.f << ", " << x.s << ">";}
sim> auto operator << (ostream &p, n y) ->
typename enable_if<!is_same<n, string>::value, decltype(y.begin(), p)>::type
{int o = 0; p << "{"; for (auto c : y) {if (o++) p << ", "; p << c;} return p << "}";}
void dor() {cerr << endl;}
sim, class...s> void dor(n p, s...y) {cerr << p << " "; dor(y...);}
sim, class s> void mini(n &p, s y) {if (p > y) p = y;}
sim, class s> void maxi(n &p, s y) {if (p < y) p = y;}

#ifdef DEB
#define debug(...) dor(__FUNCTION__, ":", __LINE__, ": ", __VA_ARGS__)
#else
#define debug(...)
#endif

#define I(x) #x " = ", (x), " "
#define A(a, i) #a "[" #i " = ", i, "] = ", a[i], " "

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

const int N = 75007;

int n, m, nodes, id, len_pion, len_poziom;

ll ans;

int sufit(int a, int b)
{
	return (a+b-1)/b;
}

int up[N];
int row[N];

void prep()
{	
	int l = id*len_poziom;
	int r = min(m-1, (id+1)*len_poziom-1);

	if(l>r)
		return;

	for(int i = 0; i < n; ++i)
	{
		for(int j = l; j <= r; ++j)
		{
			if(IsUsableCell(i, j))
				up[j]++;
			else
				up[j] = 0;
		}

		if(i%len_pion==0)
		{
			for(int j = l; j <= r; ++j)
			{
				PutLL(i/len_pion, up[j]);
			}

			Send(i/len_pion);
		}
	}	
}

void wiersz()
{
	stack<PII> S;

	ll pole = 0;

	for(int i = 0; i < m; ++i)
	{
		int width = 1;
		int curr = row[i];

		while(!S.empty() && S.top().st>=curr)
		{
			pole -= (ll)S.top().st * S.top().nd;
			width += S.top().nd;
			S.pop();
		}

		S.push(mp(curr, width));
		pole += (ll)curr*width;
		ans += pole;
	}
}

void solve()
{
	int l = id*len_pion;
	int r = min(n-1, (id+1)*len_pion-1);

	for(int i = l; i <= r; ++i)
	{
		if(i==l)
		{
			for(int j = 0; j < m; ++j)
			{
				if(j%len_poziom==0)
					Receive(j/len_poziom);

				row[j] = GetLL(j/len_poziom);
			}
		}
		else
		{
			for(int j = 0; j < m; ++j)
			{
				if(IsUsableCell(i, j))
					++row[j];
				else
					row[j] = 0;
			}
		}

		wiersz();		
	}
}

int32_t main()
{
	n = GetFieldHeight();
	m = GetFieldWidth();
	nodes = NumberOfNodes();
	//nodes = min(nodes, n);
	//nodes = min(nodes, m);
	id = MyNodeId();
		
	//if(id>=nodes)
	//	return 0;

	len_pion = sufit(n, nodes);
	len_poziom = sufit(m, nodes);
	
	prep();
	solve();

	PutLL(0, ans);
	Send(0);

	if(id==0)
	{
		ll sum = 0;

		for(int i = 0; i < nodes; ++i)
		{
			Receive(i);
			sum += GetLL(i);
		}

		cout << sum << endl;
	}
}