Submitted: 105 Accepted: 32

### Problem Description

There be exist one hook which is a tool for child.The hook is made up of several consecutive metallic sticks which are of the same length.

Now Marry,a child love to play,wants to do some operations on the hook.

Let us number the consecutive metallic sticks of the hook from 1 to N. For each operation, Marry can change the consecutive metallic sticks, numbered from X to Y, into cupreous sticks, silver sticks or golden sticks.

The total value of the hook is calculated as the sum of values of N metallic sticks. More precisely, the value for each kind of stick is calculated as follows:

For each cupreous stick, the value is 1.

For each silver stick, the value is 2.

For each golden stick, the value is 3.

Marry wants to know the total value of the hook after performing the operations.

You may consider the original hook is made up of cupreous sticks.

### Input

For each case, the first line contains an integer N, 1<=N<=100,000, which is the number of the sticks of Marry’s meat hook and the second line contains an integer Q, 0<=Q<=100,000, which is the number of the operations.

Next Q lines, each line contains three integers X, Y, 1<=X<=Y<=N, Z, 1<=Z<=3, which defines an operation: change the sticks numbered from X to Y into the metal kind Z, where Z=1 represents the cupreous kind, Z=2 represents the silver kind and Z=3 represents the golden kind.

### Output

### Sample Input

1 9 2 2 4 2 3 8 3

### Sample Output

Case 1: The total value of the hook is 22.