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Max value after m range operation
       

Given an array of size N with all initial values as 0, write a program to perform following M range increment operations as shown below:
 

increment(a, b, k) : Increment values from 'a'
                     to 'b' by 'k'.  

After M operations, calculate the maximum value 
in the array.

Input:
First line of input contains a single integer T which denotes the number of test cases. T test cases follows. First line of each test case contains two space separated integers N and M. Next M lines of each test case contains three space separated integers a , b and k.

Output:
For each test case print the maximum element in the array after M increment operations.

Constraints:
1<=T<=100
1<=N<=105
1<=M<=1000

0<= a,b <= N-1

Example:
Input:

2
5 3
0 1 100
1 4 100
2 3 100
4 3
1 2 603
0 0 286
3 3 882
Output:
200
882

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Harsh Agarwal

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