Module: (C++) Practicum - 3: Loop statements "A few facts about Harry Potter"


Problem

7 /7


Transfiguration

Problem

Transfiguration  (English Transfiguration; literally «transfiguration», «transfiguration») — a discipline that studies the magical ways transformation of some objects into others, inanimate objects into living ones and vice versa, as well as one living objects into others. A special case of transfiguration is the creation of objects from nothing or their disappearance. The subject is extremely complex and requires certain magical powers and strict concentration. Transfiguration requires a magic wand and knowledge of the appropriate formula.

Known Number  \(n >= 2\)  transfigure to sum \(1 \cdot 2+2 \cdot 3+...+(n-1) \cdot n\).
Print your answer as a calculated expression and its value exactly as shown in the example.

Input 
Enter a natural number.

Imprint 
Print the answer to the problem.
 

 

Examples
# Input Output
1 4 1*2+2*3+3*4=20
2 2 1*2=2