#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <cfloat>
#include <ctime>
#include <cassert>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <numeric>
#include <list>
#include <iomanip>
 
using namespace std;
 
#if __GNUC__
#include <tr1/unordered_map>
#include <tr1/unordered_set>
using namespace tr1;
#else
#include <unordered_map>
#include <unordered_set>
#endif
 
#ifdef __GNUC__
template <class T> int popcount(T n);
template <> int popcount(unsigned int n) { return __builtin_popcount(n); }
template <> int popcount(int n) { return __builtin_popcount(n); }
template <> int popcount(unsigned long long n) { return __builtin_popcountll(n); }
template <> int popcount(long long n) { return __builtin_popcountll(n); }
#else
#define __typeof__ decltype
template <class T> int popcount(T n) { return n ? 1 + popcount(n & (n - 1)) : 0; }
#endif
 
#define rep(i, n) for (int i = 0; i < (int)n; ++i)
#define foreach(it, c) for (__typeof__((c).begin()) it=(c).begin(); it != (c).end(); ++it)
#define rforeach(it, c) for (__typeof__((c).rbegin()) it=(c).rbegin(); it != (c).rend(); ++it)
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define CL(arr, val) memset(arr, val, sizeof(arr))
#define COPY(dest, src) memcpy(dest, src, sizeof(dest))
 
template <class T> void max_swap(T& a, const T& b) { a = max(a, b); }
template <class T> void min_swap(T& a, const T& b) { a = min(a, b); }
 
typedef long long ll;
typedef pair<int, int> pint;
 
template <class T, class U> ostream& operator<<(ostream& os, pair<T, U>& p) { os << "( " << p.first << ", " << p.second << " )"; return os;  }
 
template <class T> string to_s(const T& a) { ostringstream os; os << a; return os.str(); }
 
 
bool valid_pos(int x, int y, int w, int h) { return 0 <= x && x < w && 0 <= y && y < h; }
 
template <class T> void print(T a, int n, int br = 1, const string& deli = ", ") { cout << "{ "; for (int i = 0; i < n; ++i) { cout << a[i]; if (i + 1 != n) cout << deli; } cout << " }"; while (br--) cout << endl; }
template <class T> void print(const vector<T>& v, int br = 1, const string& deli = ", ") { print(v, v.size(), br, deli); }
template <class T> void print2d(T a, int w, int h, int width = -1, int br = 1) { for (int i = 0; i < h; ++i) { for (int j = 0; j < w; ++j) {	if (width != -1) cout.width(width); cout << a[i][j] << ' ';	} cout << endl; } while (br--) cout << endl; }
 
template <class T> void input(T& a, int n) { for (int i = 0; i < n; ++i) cin >> a[i]; }
template <class T, class U> void input(T& a, U& b, int n) { for (int i = 0; i < n; ++i) cin >> a[i] >> b[i]; }

const int mod = 1000000007;
const double PI = acos(-1.0);
const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { 1, 0, -1, 0 };
 

/*
struct kyuri
{
	int a, b, x;
	bool operator<(const kyuri& t) const
	{
		return a + x > t.a + t.x;
	}
};
kyuri h[5 * 100100];
bool in_kyuri[5033][5033];
int res = 0;
void dfs(int a, int b, int x)
{
	if (x >= 0 && !in_kyuri[a][b])
	{
		in_kyuri[a][b] = true;
		dfs(a + 1, b, x - 1);
		dfs(a + 1, b + 1, x - 1);
	}
}
int main()
{
	ios::sync_with_stdio(false);

	int n, m;
	cin >> n >> m;

	for (int i = 0; i < m; ++i)
		cin >> h[i].a >> h[i].b >> h[i].x;
	sort(h, h + m);

	
	for (int i = 0; i < m; ++i)
		dfs(h[i].a, h[i].b, h[i].x);

	int res = 0;
	for (int a = 1; a <= n; ++a)
		for (int b = 1; b <= a; ++b)
			if (in_kyuri[a][b])
				++res;
	cout << res << endl;
}
*/

int main()
{
	ios::sync_with_stdio(false);

	int n, m;
	cin >> n >> m;

	static short dp[5005][5005];
	while (m--)
	{
		short a, b, x;
		cin >> a >> b >> x;
		dp[a][b] = x + 1;
	}

	int res = 0;
	for (int i = 1; i <= n; ++i)
	{
		for (int j = 1; j <= i; ++j)
		{
			short nx = dp[i][j] - 1;
			if (nx >= 0)
				++res;
			max_swap<short>(dp[i + 1][j], nx);
			max_swap<short>(dp[i + 1][j + 1], nx);
		}
	}
	cout << res << endl;
}

Measured memory_bytes: 40000