PROGRAMMING:For loop exercise: find the cumulative sum of 1 to X and output the result value directly.

From the keyboard input data within 100 data X (x for general, variable name custom) output 1 to x sum.
###Input format:
X is a positive integer within 100.
###Output format:
Output the result of 1 + 2 + 3 +... X.
###Input example:
Here is a set of inputs. For example:
```in
five
```
###Output example:
The corresponding output is given here. For example:
```out
fifteen
```







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