#include<cstdio>
#include<queue>
#include<vector>
#define syy myson
using namespace std;
const int maxn=201;
int n,p,u[maxn],c[maxn],w[maxn][maxn],inque[maxn],i,j;
queue<int>q;
vector<int>v[maxn];
int Main()
{
	freopen("sjwl.in","r",stdin);freopen("sjwl.out","w",stdout);
	scanf("%d%d",&n,&p);
	for(i=1;i<=n;i++)
	{
		scanf("%d%d",&c[i],&u[i]);
		if(c[i]>0)
		{
			q.push(i);
			inque[i]=1;
		}
	}
	while(p--)
	{
		int a,b,c;
		scanf("%d%d%d",&a,&b,&c);
		v[a].push_back(b);
		w[a][b]=c;
	}
	while(!q.empty())
	{
		int now=q.front();
		q.pop();
		if(c[now]>0)
		for(i=0;i<v[now].size();i++)
		{
			int to=v[now][i];
			c[to]+=(w[now][to]*c[now]);
			if(!inque[to])
			{
				c[to]-=u[to];
				q.push(to);
				inque[to]=1;
			}
		}
	}
	int no=1;
	for(i=1;i<=n;i++)
	if((v[i].size()==0)&&(c[i]>0))
	{
		printf("%d %d\n",i,c[i]);
		no=0; 
	} 
	if(no)printf("NULL\n");
	return 0;
}
int main(){;}
int syy=Main();