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#include<bits/stdc++.h>
#define rep(i,k,n) for(ll i= (ll) k;i< (ll) n;i++)
#define all(v) (v).begin(), (v).end()
#define SZ(v) (int)((v).size())
#define pb push_back
#define ft first
#define sd second
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
const long long INF = 1e18L + 1;
const int IINF = 1e9 + 1;

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

using namespace std;

const int bufSize = 1000;
int N, myId, H, W, myH;
vector<vector<short int>> myGrid;
vector<int> topRow;

void init() {
	N = NumberOfNodes();
	myId = MyNodeId();
	H = GetFieldHeight();
	W = GetFieldWidth();
	int myOffset = H / N * myId;
	myH = H / N;
	if (myId == N - 1) {
		myH += H - H / N * N;
	}
	myGrid = vector<vector<short int>>(myH, vector<short int>(W));
	rep (i, 0, myH) {
		rep (j, 0, W) {
			myGrid[i][j] = IsUsableCell(myOffset + i, j);
		}
	} 
	topRow.resize(W);
}

void dp() {
	rep (i, 1, myH) {
		rep (j, 0, W) {
			if (myGrid[i][j]) {
				myGrid[i][j] = myGrid[i - 1][j] + 1;
			}
		}
	}
}

vector<int> readVector(int Id) {
	vector<int> V(W);
	rep (i, 0, W) {
		if (i % bufSize == 0) {
			Receive(Id);
		}
		V[i] = GetInt(Id);
	}
	return V;
}

void writeVector(int Id, vector<int> V) {
	rep (i, 0, W) {
		PutInt(Id, V[i]);
		if (i % bufSize == bufSize - 1 or i == W - 1) {
			Send(Id);
		}
	}
}

void talk() {
	if (myId > 0) {
		topRow = readVector(myId - 1);
	}
	vector<int> botRow(W);
	if (myH == 0) {
		botRow = topRow;
	} else {
		rep (j, 0, W) {
			if (myGrid[myH - 1][j] == myH) {
				botRow[j] = topRow[j] + myH;
			} else {
				botRow[j] = myGrid[myH - 1][j];
			}
		}
	}
	if (myId != N - 1) {
		writeVector(myId + 1, botRow);
	}
}

struct st {
	ll h, ind, sum;
};

ll calc() {
	ll res = 0;
	rep (i, 0, myH) {
		//cout << i << "  ----------------------------------\n\n";
		stack<st> S;
		S.push({0, -1, 0});
		rep (j, 0, W) {
			if (myGrid[i][j] == 0) {
				topRow[j] = 0;
			}
			int g = topRow[j] + myGrid[i][j];
			int k = j;
			while (g < S.top().h) {
				k = S.top().ind;
				S.pop();
			}
			//cout << j << " " << k << " " << g << "\n";
			if (g > S.top().h) {
				S.push({g, k, S.top().sum + (ll)S.top().h * (k - S.top().ind)});
			}
			//cout << SZ(S) << " " << S.top().h << " " << S.top().ind << " " << S.top().sum << endl;
			
			//cout << S.top().sum << " " << (ll)g * (j - S.top().ind + 1) << endl;
			res += S.top().sum + (ll)g * (j - S.top().ind + 1);
		}
	}
	return res;
}

void report(ll res) {
	if (myId > 0) {
		PutLL(0, res);
		Send(0);
	} else {
		rep (i, 1, N) {
			Receive(i);
			res += GetLL(i);
		}
		cout << res;
	}
}

int main() {
	init();
	dp();
	talk();
	ll res = calc();
	report(res);
}