#include<fstream>
using namespace std;
ifstream f("reconst.in");
ofstream g("reconst.out");
int x,y,s,v[2010],a[2013],n,m,i,j;
void rez(int x,int y,int val)
{
    if(v[x]==0)
    {
        v[x]=y;
        a[x]=val;
    }
    else
    if(v[x]<y)
    {
        rez(v[x]+1,y,val-a[x]);
    }
    else
    {
        rez(y+1,v[x],a[x]-val);
    }
}
int main()
{
    f>>n>>m;
    for(i=1;i<=m;++i)
    {
        f>>x>>y>>s;
        rez(x,y,s);
    }
    for(i=n;i;--i)
    for(j=i+1;j<=v[i];++j)
    a[i]-=a[j];
//    for(i=1;i<=n;++i)
  //  g<<a[i]<<' ';
    return 0;
}