# include <iostream>
# include <algorithm>
#include <array>
# include <cassert>
#include <cctype>
#include <climits>
#include <numeric>
# include <vector>
# include <string>
# include <set>
# include <map>
# include <cmath>
# include <iomanip>
# include <functional>
# include <tuple>
# include <utility>
# include <stack>
# include <queue>
# include <list>
# include <bitset>
# include <complex>
# include <chrono>
# include <random>
# include <limits.h>
# include <unordered_map>
# include <unordered_set>
# include <deque>
# include <cstdio>
# include <cstring>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
constexpr long long MOD = 1000000000 + 7;
constexpr long long INF = std::numeric_limits<long long>::max();
const double PI = acos(-1);
#define fir first
#define sec second
typedef pair<LL, LL> Pll;
typedef pair<LL, pair<LL, LL>> Ppll;
typedef pair<LL, pair<LL, bitset<100001>>> Pbll;
typedef pair<LL, pair<LL, vector<LL>>> Pvll;
typedef pair<LL, LL> Vec2;
struct Tll { LL first, second, third; };
typedef pair<LL, Tll> Ptll;
#define rep(i,rept) for(LL i=0;i<rept;i++)
#define Mfor(i,mf) for(LL i=mf-1;i>=0;i--)
LL h, w, n, m, k, s, t, q, sum, last, cnt, ans,a[2100][2100],d[2100][2100];
struct Edge { LL to, cost; };
string str;
void YN(bool f) {
	if (f)
		cout << "YES" << endl;
	else
		cout << "NO" << endl;
}
void yn(bool f) {
	if (f)
		cout << "Yes" << endl;
	else
		cout << "No" << endl;
}
int main() {
	cin >> n >> k;
	rep(i, n) {
		LL x, y, z;
		cin >> x >> y >> z;
		a[x + 500][y + 500] = z;
	}
	rep(i, k) {
		LL x1, y1, x2, y2, z;
		cin >> x1 >> y1 >> x2 >> y2 >> z;
		x1 += 500, y1 += 500, x2 += x1+1, y2 += y1+1;
		d[x1][y1] += z;
		d[x2][y1] -= z;
		d[x1][y2] -= z;
		d[x2][y2] += z;
	}
	rep(i, 1008)
		rep(j, 1008)
		d[j + 1][i] += d[j][i];
	rep(i, 1008)
		rep(j, 1008)
		d[i][j + 1] += d[i][j];
	rep(i, 1008)
		rep(j, 1008) {
		if (a[i][j] > 0) {
			ans += max(a[i][j] - d[i][j], (LL)0);
		}
	}
	cout << ans << endl;
	return 0;
}