{"raw_statement":[{"iden":"problem statement","content":"There is a farm whose length and width are $A$ yard and $B$ yard, respectively. A farmer, John, made a vertical road and a horizontal road inside the farm from one border to another, as shown below: (The gray part represents the roads.)\n![image](https://img.atcoder.jp/ghi/27d063746b460f1132b6a99aa535a562.png)\nWhat is the area of this yard excluding the roads? Find it."},{"iden":"note","content":"It can be proved that the positions of the roads do not affect the area."},{"iden":"constraints","content":"*   $A$ is an integer between $2$ and $100$ (inclusive).\n*   $B$ is an integer between $2$ and $100$ (inclusive)."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$A$ $B$"},{"iden":"sample input 1","content":"2 2"},{"iden":"sample output 1","content":"1\n\nIn this case, the area is $1$ square yard."},{"iden":"sample input 2","content":"5 7"},{"iden":"sample output 2","content":"24\n\nIn this case, the area is $24$ square yards."}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}