{"raw_statement":[{"iden":"problem statement","content":"There are $N$ children in AtCoder Kindergarten. Mr. Evi will arrange the children in a line, then give $1$ candy to the first child in the line, $2$ candies to the second child, ..., $N$ candies to the $N$\\-th child. How many candies will be necessary in total?"},{"iden":"constraints","content":"*   $1≦N≦100$"},{"iden":"input","content":"The input is given from Standard Input in the following format:\n\n$N$"},{"iden":"sample input 1","content":"3"},{"iden":"sample output 1","content":"6\n\nThe answer is $1+2+3=6$."},{"iden":"sample input 2","content":"10"},{"iden":"sample output 2","content":"55\n\nThe sum of the integers from $1$ to $10$ is $55$."},{"iden":"sample input 3","content":"1"},{"iden":"sample output 3","content":"1\n\nOnly one child. The answer is $1$ in this case."}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}