{"problem":{"name":"Trapezoids","description":{"content":"You are given a trapezoid. The lengths of its upper base, lower base, and height are $a$, $b$, and $h$, respectively. ![image](https://atcoder.jp/img/arc061/1158e37155d46a42e90f31566478e6da.png)An ex","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc045_a"},"statements":[{"statement_type":"Markdown","content":"You are given a trapezoid. The lengths of its upper base, lower base, and height are $a$, $b$, and $h$, respectively.\n\n![image](https://atcoder.jp/img/arc061/1158e37155d46a42e90f31566478e6da.png)An example of a trapezoid\n\nFind the area of this trapezoid.\n\n## Constraints\n\n*   $1≦a≦100$\n*   $1≦b≦100$\n*   $1≦h≦100$\n*   All input values are integers.\n*   $h$ is even.\n\n## Input\n\nThe input is given from Standard Input in the following format:\n\n$a$\n$b$\n$h$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc045_a","tags":[],"sample_group":[["3\n4\n2","7\n\nWhen the lengths of the upper base, lower base, and height are $3$, $4$, and $2$, respectively, the area of the trapezoid is $(3+4)×2/2 = 7$."],["4\n4\n4","16\n\nIn this case, a parallelogram is given, which is also a trapezoid."]],"created_at":"2026-03-03 11:01:13"}}