PROGRAMMING:Finding the sum of 1 + 2 +... + n

Input a positive integer n (assuming n < = 100), find the sum of 1 + 2 +... + N, and output the corresponding operation expression
###Input format:
A positive integer n
###Output format:
Corresponding operation expression
###Input example:
Here is a set of inputs. For example:
```in
ten
```
###Output example:
The corresponding output is given here. For example:
```out
1+2+3+4+5+6+7+8+9+10=55
```







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